I

I

Ibidem in the same place

Ichthyology study of fish

Iconoclast one who rails against sacred institutions

idiosyncrasy peculiarity

idyllic natural, picturesque

ignoble dishonorable

ilk class, clan

illicit unlawful

illimitable limitless

illusory fleeting, deceptive

illustrious famous

imbibe drink

imbue infuse

immaculate spotlessly clean

immaterial irrelevant

immense huge

immerse bathe, engross

imminent about to happen

immobile still

immolate sacrifice (especially by fire)

immunity exemption from prosecution

immure build a wall around

immutable unchangeable, absolute

impair injure

impale pierce

impartial not biased

impasse deadlock

impassioned fiery, emotional

impassive calm

impeach accuse, charge

impeccable faultless

impecunious indigent

impede hinder

impediment obstacle

impel urge, force

impending approaching, imminent

imperative vital, pressing

imperceptible slight, intangible

imperialism colonialism

imperil endanger

imperious domineering

impertinent insolent

imperturbable calm, unflappable

impervious impenetrable, unreceptive

impetuous impulsive

impetus stimulus, spark

impinge encroach, touch

implant instill

implausible unlikely, improbable

implement carry out, execute

implicate incriminate

implicit implied

implore entreat

implosion bursting inward

impolitic unwise, inappropriate

imponderable difficult to estimate

import meaning, significance

importune urgent request

imposing intimidating, stately

imposition intrusion, burden

impotent powerless

impound seize

imprecation curse, inculcate

impregnable invincible

impresario promoter

impressionable susceptible, easily influenced

impressionism a style of painting

imprimatur sanction

impromptu spontaneous

improvise invent

impudence insolence

impugn criticize, accuse

impulse inclination, sudden desire

impulsive to act suddenly

impunity exemption from harm

impute charge

in toto in full, entirely

inadvertent unintentional

inadvisable not recommended

inalienable that which cannot be taken away

inane vacuous, stupid

inanimate inorganic, lifeless

inaudible cannot be heard

inaugurate induct (with a ceremony)

inborn innate

incalculable immeasurable

incandescent brilliant

incantation chant

incapacitate disable

incarcerate imprison

incarnate embody, personify

incendiary inflammatory

incense enrage

incentive stimulus, inducement

incessant unceasing

incest sex among family members

inchoate just begun

incidental insignificant, minor

incinerate burn

incipient beginning

incision cut

incisive keen, penetrating

incite foment, provoke

incivility rudeness

inclement harsh, stormy

inclusive comprehensive

incognito disguised

incommunicado unable to communicate with others

incomparable peerless

incompatibility inability to live in harmony

inconceivable unthinkable

incongruous out of place, absurd

inconsiderate thoughtless, insensitive

inconspicuous not noticeable

incontrovertible indisputable

incorporate combine

incorrigible unreformable

incredulous skeptical

increment step, increase

incriminate accuse

incubus nightmare

inculcate instill, indoctrinate

inculpate accuse

incumbent obligatory

incursion raid

indecent offensive, lewd

indecorous unseemly

indelible permanent

indemnity insurance

indict charge

indifferent unconcerned

indigenous native

indigent poor

indignant resentment of injustice

indiscreet lacking sound judgment, rash

indiscriminate random

indispensable vital, essential

indistinct blurry, without clear features

indolent lazy

indomitable invincible

indubitable unquestionable

induce persuade, provoke

indulge succumb to desire

indurate harden

industrious hard-working

inebriate intoxicate

ineffable inexpressible

ineffectual futile

ineluctable inescapable

inept unfit, incompetent

inert inactive

inestimable priceless, immeasurable

inevitable unavoidable, predestined

inexorable relentless

infallible unerring

infamous notorious

infamy shame

infantry foot soldiers

infatuate immature love

infer conclude

infernal hellish

infidel nonbeliever

infidelity disloyalty

infiltrate trespass

infinitesimal very small

infirmary clinic

infirmity ailment

inflammatory incendiary

influx inflow

infraction violation

infringe encroach

infuriate enrage

infuse inspire, instill

ingenious clever, resourceful

ingrate ungrateful person

ingratiate pleasing, flattering, endearing

ingress entering

inherent innate, inborn

inhibit restrain

inimical adverse, hostile

inimitable peerless

iniquitous unjust, wicked

iniquity sin, injustice

initiate begin

initiation induction ceremony

injunction command

inkling hint

innate inborn

innervate invigorate

innocuous harmless

innovative new, useful idea

innuendo insinuation

inopportune untimely

inordinate excessive

inquest investigation

inquisition interrogation

inquisitive curious

insatiable gluttonous

inscribe engrave

inscrutable cannot be fully understood

insensate without feeling

insidious treacherous, sinister

insignia emblems

insinuate allude

insipid flat, dull

insolent insulting

insolvent bankrupt

insouciant nonchalant

installment portion, payment

instant at once

instigate incite

insubordinate disobedient

insufferable unbearable

insular narrow-minded

insuperable insurmountable

insurgent rebellious

insurrection uprising

intangible not perceptible by touch

integral essential

integrate make whole

integration unification

integument a covering

intelligentsia the intellectual elite of society

intensive extreme, concentrated

inter bury

intercede plead on behalf of another

intercept prevent, cut off

interdict prohibit

interject interrupt

interloper intruder

interlude intermission

interminable unending

internecine mutually destructive

interpolate insert

interpose insert

interregnum interval between two successive reigns

interrogate question

intersperse scatter

interstate between states

intervene interfere, mediate

intestate leaving no will

intimate allude to, hint

intractable unmanageable

intransigent unyielding

intrepid fearless

intricate complex

intrigue plot, mystery

intrinsic inherent

introspection self-analysis

inundate flood

inure accustom, habituate, harden

invalidate disprove, nullify

invective verbal insult

inveigh to rail against

inveigle lure, wheedle

inventive cleaver, resourceful

inverse directly opposite

inveterate habitual, chronic

invidious incurring ill-will

invincible cannot be defeated

inviolate sacred, unchangeable

invocation calling on God

irascible irritable

irate angry

ironic oddly contrary to what is expected

irrational illogical

irrelevant unrelated, immaterial

irreparable cannot be repaired

irresolute hesitant, uncertain

irrevocable cannot be rescinded

isosceles having two equal sides

itinerant wandering

itinerary route