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- ichthyic
- adj. Fish-like.
- ichthyology
- n. The branch of zoology that treats of fishes.
- ichthyosaurs
- n. A fossil reptile.
- iciness
- n. The state of being icy.
- icon
- n. An image or likeness.
- iconoclast
- n. An image-breaker.
- idealize
- v. To make to conform to some mental or imaginary standard.
- idiom
- n. A use of words peculiar to a particular language.
- idiosyncrasy
- n. A mental quality or habit peculiar to an individual.
- idolize
- v. To regard with inordinate love or admiration.
- ignoble
- adj. Low in character or purpose.
- ignominious
- adj. Shameful.
- Iliad
- n. A Greek epic poem describing scenes from the siege of Troy.
- illegal
- adj. Not according to law.
- illegible
- adj. Undecipherable.
- illegitimate
- adj. Unlawfully begotten.
- illiberal
- adj. Stingy.
- illicit
- adj. Unlawful.
- illimitable
- adj. Boundless.
- illiterate
- adj. Having little or no book-learning.
- ill-natured
- adj. Surly.
- illogical
- adj. Contrary to the rules of sound thought.
- illuminant
- n. That which may be used to produce light.
- illuminate
- v. To supply with light.
- illumine
- v. To make bright or clear.
- illusion
- n. An unreal image presented to the senses.
- illusive
- adj. Deceptive.
- illusory
- adj. Deceiving or tending to deceive, as by false appearance.
- imaginable
- adj. That can be imagined or conceived in the mind.
- imaginary
- adj. Fancied.
- imbibe
- v. To drink or take in.
- imbroglio
- n. A misunderstanding attended by ill feeling, perplexity, or strife.
- imbrue
- v. To wet or moisten.
- imitation
- n. That which is made as a likeness or copy.
- imitator
- n. One who makes in imitation.
- immaculate
- adj. Without spot or blemish.
- immaterial
- adj. Of no essential consequence.
- immature
- adj. Not full-grown.
- immeasurable
- adj. Indefinitely extensive.
- immense
- adj. Very great in degree, extent, size, or quantity.
- immerse
- v. To plunge or dip entirely under water or other fluid.
- immersion
- n. The act of plunging or dipping entirely under water or another fluid.
- immigrant
- n. A foreigner who enters a country to settle there.
- immigrate
- v. To come into a country or region from a former habitat.
- imminence
- n. Impending evil or danger.
- imminent
- adj. Dangerous and close at hand.
- immiscible
- adj. Separating, as oil and water.
- immoral
- adj. Habitually engaged in licentious or lewd practices.
- immortalize
- v. To cause to last or to be known or remembered throughout a great or indefinite length of time.
- immovable
- adj. Steadfast.
- immune
- adj. Exempt, as from disease.
- immutable
- adj. Unchangeable.
- impair
- v. To cause to become less or worse.
- impalpable
- adj. Imperceptible to the touch.
- impartial
- adj. Unbiased.
- impassable
- adj. That can not be passed through or over.
- impassible
- adj. Not moved or affected by feeling.
- impassive
- adj. Unmoved by or not exhibiting feeling.
- impatience
- n. Unwillingness to brook delays or wait the natural course of things.
- impeccable
- adj. Blameless.
- impecunious
- adj. Having no money.
- impede
- v. To be an obstacle or to place obstacles in the way of.
- impel
- v. To drive or urge forward.
- impend
- v. To be imminent.
- imperative
- adj. Obligatory.
- imperceptible
- adj. Indiscernible.
- imperfectible
- adj. That can not be perfected.
- imperil
- v. To endanger.
- imperious
- adj. Insisting on obedience.
- impermissible
- adj. Not permissible.
- impersonal
- adj. Not relating to a particular person or thing.
- impersonate
- v. To appear or act in the character of.
- impersuadable
- adj. Unyielding.
- impertinence
- n. Rudeness.
- imperturbable
- adj. Calm.
- impervious
- adj. Impenetrable.
- impetuosity
- n. Rashness.
- impetuous
- adj. Impulsive.
- impetus
- n. Any impulse or incentive.
- impiety
- n. Irreverence toward God.
- impious
- adj. Characterized by irreverence or irreligion.
- implausible
- adj. Not plausible.
- impliable
- adj. Capable of being inferred.
- implicate
- v. To show or prove to be involved in or concerned
- implicit
- adj. Implied.
- imply
- v. To signify.
- impolitic
- adj. Inexpedient.
- importation
- n. The act or practice of bringing from one country into another.
- importunate
- adj. Urgent in character, request, or demand.
- importune
- v. To harass with persistent demands or entreaties.
- impotent
- adj. Destitute of or lacking in power, physical, moral, or intellectual.
- impoverish
- v. To make indigent or poor.
- impracticable
- adj. Not feasible.
- impregnable
- adj. That can not be taken by assault.
- impregnate
- v. To make pregnant.
- impromptu
- n. Anything done or said on the impulse of the moment.
- improper
- adj. Not appropriate, suitable, or becoming.
- impropriety
- n. The state or quality of being unfit, unseemly, or inappropriate.
- improvident
- adj. Lacking foresight or thrift.
- improvise
- v. To do anything extemporaneously or offhand.
- imprudent
- adj. Heedless.
- impudence
- n. Insolent disrespect.
- impugn
- v. To assail with arguments, insinuations, or accusations.
- impulsion
- n. Impetus.
- impulsive
- adj. Unpremeditated.
- impunity
- n. Freedom from punishment.
- impure
- adj. Tainted.
- impute
- v. To attribute.
- inaccessible
- adj. Difficult of approach.
- inaccurate
- adj. Not exactly according to the facts.
- inactive
- adj. Inert.
- inadequate
- adj. Insufficient.
- inadmissible
- adj. Not to be approved, considered, or allowed, as testimony.
- inadvertent
- adj. Accidental.
- inadvisable
- adj. Unadvisable.
- inane
- adj. Silly.
- inanimate
- adj. Destitute of animal life.
- inapprehensible
- adj. Not to be understood.
- inapt
- adj. Awkward or slow.
- inarticulate
- adj. Speechless.
- inaudible
- adj. That can not be heard.
- inborn
- adj. Implanted by nature.
- inbred
- adj. Innate.
- incandescence
- n. The state of being white or glowing with heat.
- incandescent
- adj. White or glowing with heat.
- incapacitate
- v. To deprive of power, capacity, competency, or qualification.
- incapacity
- n. Want of power to apprehend, understand, and manage.
- incarcerate
- v. To imprison.
- incendiary
- n. Chemical or person who starts a fire-literally or figuratively.
- incentive
- n. That which moves the mind or inflames the passions.
- inception
- n. The beginning.
- inceptive
- adj. Beginning.
- incessant
- adj. Unceasing.
- inchoate
- adj. Incipient.
- inchoative
- n. That which begins, or expresses beginning.
- incidence
- n. Casual occurrence.
- incident
- n. A happening in general, especially one of little importance.
- incinerate
- v. To reduce to ashes.
- incipience
- n. Beginning.
- incipient
- adj. Initial.
- incisor
- n. A front or cutting tooth.
- incite
- v. To rouse to a particular action.
- incitement
- n. That which moves to action, or serves as an incentive or stimulus.
- incoercible
- adj. Incapable of being forced, constrained, or compelled.
- incoherence
- n. Want of connection, or agreement, as of parts or ideas in thought, speech, etc.
- incoherent
- adj. Not logically coordinated, as to parts, elements, or details.
- incombustible
- adj. That can not be burned.
- incomparable
- adj. Matchless.
- incompatible
- adj. Discordant.
- incompetence
- n. General lack of capacity or fitness.
- incompetent
- adj. Not having the abilities desired or necessary for any purpose.
- incomplete
- adj. Lacking some element, part, or adjunct necessary or required.
- incomprehensible
- adj. Not understandable.
- incompressible
- adj. Resisting all attempts to reduce volume by pressure.
- inconceivable
- adj. Incomprehensible.
- incongruous
- adj. Unsuitable for the time, place, or occasion.
- inconsequential
- adj. Valueless.
- inconsiderable
- adj. Small in quantity or importance.
- inconsistent
- adj. Contradictory.
- inconstant
- adj. Changeable.
- incontrovertible
- adj. Indisputable.
- inconvenient
- adj. Interfering with comfort or progress.
- indefensible
- adj. Untenable.
- indelible
- adj. That can not be blotted out, effaced, destroyed, or removed.
- indescribable
- adj. That can not be described.
- indestructible
- adj. That can not be destroyed.
- indicant
- adj. That which points out.
- indicator
- n. One who or that which points out.
- indict
- v. To find and declare chargeable with crime.
- indigence
- n. Poverty.
- indigenous
- adj. Native.
- indigent
- adj. Poor.
- indigestible
- adj. Not digestible, or difficult to digest.
- indigestion
- n. Difficulty or failure in the alimentary canal in changing food into absorptive nutriment.
- indignant
- adj. Having such anger and scorn as is aroused by meanness or wickedness.
- indignity
- n. Unmerited contemptuous conduct or treatment.
- indiscernible
- adj. Not perceptible.
- indiscreet
- adj. Lacking wise judgment.
- indiscriminate
- adj. Promiscuous.
- indispensable
- adj. Necessary or requisite for the purpose.
- indistinct
- adj. Vague.
- indivertible
- adj. That can not be turned aside.
- indivisible
- adj. Not separable into parts.
- indolence
- n. Laziness.
- indolent
- adj. Habitually inactive or idle.
- indomitable
- adj. Unconquerable.
- induct
- v. To bring in.
- indulgence
- n. The yielding to inclination, passion, desire, or propensity in oneself or another.
- indulgent
- adj. Yielding to the desires or humor of oneself or those under one's care.
- inebriate
- v. To intoxicate.
- inedible
- adj. Not good for food.
- ineffable
- adj. Unutterable.
- inefficient
- adj. Not accomplishing an intended purpose.
- inefficiency
- n. That which does not accomplish an intended purpose.
- ineligible
- adj. Not suitable to be selected or chosen.
- inept
- adj. Not fit or suitable.
- inert
- adj. Inanimate.
- inestimable
- adj. Above price.
- inevitable
- adj. Unavoidable.
- inexcusable
- adj. Not to be justified.
- inexhaustible
- adj. So large or furnishing so great a supply as not to be emptied, wasted, or spent.
- inexorable
- adj. Unrelenting.
- inexpedient
- adj. Unadvisable.
- inexpensive
- adj. Low-priced.
- inexperience
- n. Lack of or deficiency in experience.
- inexplicable
- adj. Such as can not be made plain.
- inexpressible
- adj. Unutterable.
- inextensible
- adj. Of unchangeable length or area.
- infallible
- adj. Exempt from error of judgment, as in opinion or statement.
- infamous
- adj. Publicly branded or notorious, as for vice, or crime.
- infamy
- n. Total loss or destitution of honor or reputation.
- inference
- n. The derivation of a judgment from any given material of knowledge on the ground of law.
- infernal
- adj. Akin to or befitting hell or its occupants.
- infest
- v. To be present in such numbers as to be a source of annoyance, trouble, or danger.
- infidel
- n. One who denies the existence of God.
- infidelity
- n. Disloyalty.
- infinite
- adj. Measureless.
- infinity
- n. Boundless or immeasurable extension or duration.
- infirm
- adj. Lacking in bodily or mental strength.
- infirmary
- n. A place for the reception or treatment of the sick.
- infirmity
- n. A physical, mental, or moral weakness or flaw.
- inflammable
- adj. Easily set on fire or excited.
- inflammation
- n. A morbid process in some part of the body characterized by heat, swelling, and pain.
- inflexible
- adj. That can not be altered or varied.
- influence
- n. Ability to sway the will of another.
- influential
- adj. Having the power to sway the will of another.
- influx
- n. Infusion.
- infrequence
- n. Rareness.
- infrequent
- adj. Uncommon.
- infringe
- v. To trespass upon.
- infuse
- v. To instill, introduce, or inculcate, as principles or qualities.
- infusion
- n. The act of imbuing, or pouring in.
- ingenious
- adj. Evincing skill, originality, or cleverness, as in contrivance or arrangement.
- ingenuity
- n. Cleverness in contriving, combining, or originating.
- ingenuous
- adj. Candid, frank, or open in character or quality.
- inglorious
- adj. Shameful.
- ingraft
- v. To set or implant deeply and firmly.
- ingratiate
- v. To win confidence or good graces for oneself.
- ingratitude
- n. Insensibility to kindness.
- ingredient
- n. Component.
- inherence
- n. The state of being permanently existing in something.
- inherent
- adj. Intrinsic.
- inhibit
- v. To hold back or in.
- inhospitable
- adj. Not disposed to entertain strangers gratuitously.
- inhuman
- adj. Savage.
- inhume
- v. To place in the earth, as a dead body.
- inimical
- adj. Adverse.
- iniquity
- n. Gross wrong or injustice.
- initiate
- v. To perform the first act or rite.
- inject
- v. To introduce, as a fluid, by injection.
- injunction
- n. Mandate.
- inkling
- n. A hint.
- inland
- adj. Remote from the sea.
- inlet
- n. A small body of water leading into a larger.
- inmost
- adj. Deepest within.
- innocuous
- adj. Harmless.
- innovate
- v. To introduce or strive to introduce new things.
- innuendo
- n. Insinuation.
- innumerable
- adj. Countless.
- inoffensive
- adj. Causing nothing displeasing or disturbing.
- inopportune
- adj. Unsuitable or inconvenient, especially as to time.
- inquire
- v. To ask information about.
- inquisition
- n. A court or tribunal for examination and punishment of heretics.
- inquisitive
- adj. Given to questioning, especially out of curiosity.
- inquisitor
- n. One who makes an investigation.
- inroad
- n. Forcible encroachment or trespass.
- insatiable
- adj. That desires or craves immoderately or unappeasably.
- inscribe
- v. To enter in a book, or on a list, roll, or document, by writing.
- inscrutable
- adj. Impenetrably mysterious or profound.
- insecure
- adj. Not assured of safety.
- insensible
- adj. Imperceptible.
- insentient
- adj. Lacking the power of feeling or perceiving.
- inseparable
- adj. That can not be separated.
- insidious
- adj. Working ill by slow and stealthy means.
- insight
- n. Intellectual discernment.
- insignificance
- n. Lack of import or of importance.
- insignificant
- adj. Without importance, force, or influence.
- insinuate
- v. To imply.
- insipid
- adj. Tasteless.
- insistence
- n. Urgency.
- insistent
- adj. Urgent.
- insolence
- n. Pride or haughtiness exhibited in contemptuous and overbearing treatment of others.
- insolent
- adj. Impudent.
- insomnia
- n. Sleeplessness.
- inspector
- n. An official appointed to examine or oversee any matter of public interest or importance.
- instance
- n. A single occurrence or happening of a given kind.
- instant
- n. A very brief portion of time.
- instantaneous
- adj. Done without perceptible lapse of time.
- instigate
- v. To provoke.
- instigator
- n. One who incites to evil.
- instill
- v. To infuse.
- instructive
- adj. Conveying knowledge.
- insufficiency
- n. Inadequacy.
- insufficient
- adj. Inadequate for some need, purpose, or use.
- insular
- adj. Pertaining to an island.
- insulate
- v. To place in a detached state or situation.
- insuperable
- adj. Invincible.
- insuppressible
- adj. Incapable of being concealed.
- insurgence
- n. Uprising.
- insurgent
- n. One who takes part in forcible opposition to the constituted authorities of a place.
- insurrection
- n. The state of being in active resistance to authority.
- intangible
- adj. Not perceptible to the touch.
- integrity
- n. Uprightness of character and soundness of moral principle.
- intellect
- n. The faculty of perception or thought.
- intellectual
- adj. Characterized by intelligence.
- intelligence
- n. Capacity to know or understand.
- intelligible
- adj. Comprehensible.
- intemperance
- n. Immoderate action or indulgence, as of the appetites.
- intension
- n. The act of stringing or stretching, or state of being strained.
- intensive
- adj. Adding emphasis or force.
- intention
- n. That upon which the mind is set.
- interact
- v. To act reciprocally.
- intercede
- v. To mediate between persons.
- intercept
- v. To interrupt the course of.
- intercession
- n. Entreaty in behalf of others.
- intercessor
- n. A mediator.
- interdict
- n. Authoritative act of prohibition.
- interim
- n. Time between acts or periods.
- interlocutor
- n. One who takes part in a conversation or oral discussion.
- interlude
- n. An action or event considered as coming between others of greater length.
- intermediate
- adj. Being in a middle place or degree or between extremes.
- interminable
- adj. Having no limit or end.
- intermission
- n. A recess.
- intermit
- v. To cause to cease temporarily.
- intermittent
- adj. A temporary discontinuance.
- interpolation
- n. Verbal interference.
- interpose
- v. To come between other things or persons.
- interposition
- n. A coming between.
- interpreter
- n. A person who makes intelligible the speech of a foreigner by oral translation.
- interrogate
- v. To examine formally by questioning.
- interrogative
- adj. Having the nature or form of a question.
- interrogatory
- n. A question or inquiry.
- interrupt
- v. To stop while in progress.
- intersect
- v. To cut through or into so as to divide.
- intervale
- n. A low tract of land between hills, especially along a river.
- intervene
- v. To interfere for some end.
- intestacy
- n. The condition resulting from one's dying not having made a valid will.
- intestate
- adj. Not having made a valid will.
- intestine
- n. That part of the digestive tube below or behind the stomach, extending to the anus.
- intimacy
- n. Close or confidential friendship.
- intimidate
- v. To cause to become frightened.
- intolerable
- adj. Insufferable.
- intolerance
- n. Inability or unwillingness to bear or endure.
- intolerant
- adj. Bigoted.
- intoxicant
- n. Anything that unduly exhilarates or excites.
- intoxicate
- v. To make drunk.
- intracellular
- adj. Occurring or situated within a cell.
- intramural
- adj. Situated within the walls of a city.
- intrepid
- adj. Fearless and bold.
- intricacy
- n. Perplexity.
- intricate
- adj. Difficult to follow or understand.
- intrigue
- n. A plot or scheme, usually complicated and intended to accomplish something by secret ways.
- intrinsic
- adj. Inherent.
- introductory
- adj. Preliminary.
- introgression
- n. Entrance.
- intromit
- v. To insert.
- introspect
- v. To look into.
- introspection
- n. The act of observing and analyzing one's own thoughts and feelings.
- introversion
- n. The act of turning or directing inward, physically or mentally.
- introvert
- v. To turn within.
- intrude
- v. To come in without leave or license.
- intrusion
- n. The act of entering without warrant or invitation; encroachment.
- intuition
- n. Instinctive knowledge or feeling.
- inundate
- v. To fill with an overflowing abundance.
- inundation
- n. Flood.
- inure
- v. To harden or toughen by use, exercise, or exposure.
- invalid
- adj. Having no force, weight, or cogency.
- invalid
- n. One who is disabled by illness or injury.
- invalidate
- v. To render of no force or effect.
- invaluable
- adj. Exceedingly precious.
- invariable
- adj. Unchangeable.
- invasion
- n. Encroachment, as by an act of intrusion or trespass.
- invective
- n. An utterance intended to cast censure, or reproach.
- inveigh
- v. To utter vehement censure or invective.
- inventive
- adj. Quick at contrivance.
- inverse
- adj. Contrary in tendency or direction.
- inversion
- n. Change of order so that the first shall become last and the last first.
- invert
- v. To turn inside out, upside down, or in opposite direction.
- investigator
- n. One who investigates.
- investor
- n. One who invests money.
- inveterate
- adj. Habitual.
- invidious
- adj. Showing or feeling envy.
- invigorate
- v. To animate.
- invincible
- adj. Not to be conquered, subdued, or overcome.
- inviolable
- adj. Incapable of being injured or disturbed.
- invoke
- v. To call on for assistance or protection.
- involuntary
- adj. Unwilling.
- involution
- n. Complication.
- involve
- v. To draw into entanglement, literally or figuratively.
- invulnerable
- adj. That can not be wounded or hurt.
- iota
- n. A small or insignificant mark or part.
- irascible
- adj. Prone to anger.
- irate
- adj. Moved to anger.
- ire
- n. Wrath.
- iridescence
- n. A many-colored appearance.
- iridescent
- adj. Exhibiting changing rainbow-colors due to the interference of the light.
- irk
- v. To afflict with pain, vexation, or fatigue.
- irksome
- adj. Wearisome.
- irony
- n. Censure or ridicule under cover of praise or compliment.
- irradiance
- n. Luster.
- irradiate
- v. To render clear and intelligible.
- irrational
- adj. Not possessed of reasoning powers or understanding.
- irreducible
- adj. That can not be lessened.
- irrefragable
- adj. That can not be refuted or disproved.
- irrefrangible
- adj. That can not be broken or violated.
- irrelevant
- adj. Inapplicable.
- irreligious
- adj. Indifferent or opposed to religion.
- irreparable
- adj. That can not be rectified or made amends for.
- irrepressible
- adj. That can not be restrained or kept down.
- irresistible
- adj. That can not be successfully withstood or opposed.
- irresponsible
- adj. Careless of or unable to meet responsibilities.
- irreverence
- n. The quality showing or expressing a deficiency of veneration, especially for sacred things.
- irreverent
- adj. Showing or expressing a deficiency of veneration, especially for sacred things.
- irreverential
- adj. Showing or expressing a deficiency of veneration, especially for sacred things.
- irreversible
- adj. Irrevocable.
- irrigant
- adj. Serving to water lands by artificial means.
- irrigate
- v. To water, as land, by ditches or other artificial means.
- irritable
- adj. Showing impatience or ill temper on little provocation.
- irritancy
- n. The quality of producing vexation.
- irritant
- n. A mechanical, chemical, or pathological agent of inflammation, pain, or tension.
- irritate
- v. To excite ill temper or impatience in.
- irruption
- n. Sudden invasion.
- isle
- n. An island.
- islet
- n. A little island.
- isobar
- n. A line joining points at which the barometric pressure is the same at a specified moment.
- isochronous
- adj. Relating to or denoting equal intervals of time.
- isolate
- v. To separate from others of its kind.
- isothermal
- adj. Having or marking equality of temperature.
- itinerant
- adj. Wandering.
- itinerary
- n. A detailed account or diary of a journey.
- itinerate
- v. To wander from place to place.