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Inane

Foolishly

Inaugurate

To begin or start officially

Incandescent

Shining brightly

Incarcerate

To put in jail

Incarnadine

Blood-red in color

Incarnate

Having bodily form

Incendiary

Combustible

Incense

To infuriate

Inception

Beginning

Incessant

Continuous

Inchoate

Just begun

Incipient

Beginning to exist or appear

Incisive

Perceptive

Inclination

Tendency towards

Inclusive

Comprehensive

Incognito

in disguise

Inconceivable

Impossible

Inconsequential

Unimportant

Incontrovertible

Unquestionable

Incorrigible

Incapable of being corrected

Incredulous

Skeptical, doubtful

Inculpate

To blame

Inculcate

To teach

Incumbent

Holding a specified office, often political.

Incursion

Sudden invasion

Indefatigable

Never tired

Indefensible

Inexcusable

Indelible

Permanent

Indicative

Showing or pointing out

Indict

To accuse formally

Indigenous

Native

Indigent

Very poor

Indignant

Angry

Indolent

Habitually lazy

Indomitable

Fearless, unconquerable

Indubitable

Unquestionable

Induce

To persuade

Induct

To place ceremoniously in office

Indulge

To give in to a craving or desire

Industry

Business or trade

Inebriated

drunk

Inept

Clumsy

Inert

Unable to move

Inestimable

Too great to be estimated

Inevitable

Certain, unavoidable

Inexorable

Inflexible

Inextricable

Incapable of being untangled

Infallible

Incapable of making a mistake

Infamy

Reputation of bad deeds

Infantile

Childish, immature

Infatuated

Strongly or foolishly attracted to

Infer

To conclude

Infiltrate

To pass secretly into enemy territory

Infinitesimal

Extremely tiny

Infirmity

Disease

Infringe

To encroach

Infuriate

To anger

Infuriating

Provoking angry or outrage

Ingenious

Original, clever, inventive

Ingenuous

Straightforward

Ingrate

Ungrateful person

Ingress

entrance

Inhibit

To hold back

Inimical

Hostile

Iniquity

sin

Initiate

To begin

Inject

To force into

Injunction

Command

Inkling

Hint

Innate

Natural

Innateness

State of being natural

Innocuous

Harmless

Innovate

To invent

Innuendo

Indirect and subtle criticism

Innumerable

Too many to be counted

Inoffensive

Harmless

Inoperable

Not operable

Inquest

Investigation

Insatiable

Never satisfied

Inscrutable

Impossible to understand fully

Insentient

Unfeeling

Insidious

Sly

Insinuate

To suggest

Insipid

Bland

Insolent

Insulting and arrogant

Insoluble

Not able to be solved or explained.

Insolvent

Bankrupt, unable to pay one's debts

Instigate

To incite, urge

Insubstantial

Modest

Insular

Isolated

Insuperable

Unconquerable

Insurgent

Rebellious

Insurrection

Rebellion

Integral

Central

Integrity

Decency

Intemperate

Not moderate

Inter

To bury

Interdict

To forbid

Interject

To interpose

Interlocutor

Someone taking part in a dialogue

Interloper

Trespasser

Interminable

Endless

Intermittent

Starting and stopping

Internecine

Deadly to both sides

Interpolate

To insert

Interpose

To insert

Interregnum

Interval between reigns

Interrogate

To question formally

Intersect

To divide by passing through

Intersperse

To distribute among, mix with

Intimation

Clue

Intractable

Not easily managed

Intramural

Within an institution like a school

Intransigent

Uncompromising

Intrepid

Fearless

Intrinsic

Inherent, internal

Introspective

Contemplating one's own thoughts and feelings

Introvert

Someone given to self-analysis

Intrusion

Trespass

Intuitive

Instinctive, untaught

Inundate

To cover with water

Inure

To harden

Invalidate

To negate or nullify

Invective

Verbal abuse

Investiture

Ceremony conferring authority

Inveterate

Confirmed

Invidious

Likely to provoke ill-will, offensive

Invincible

Invulnerable, unbeatable

Inviolable

Safe from violation or assault

Invoke

To call upon

Iota

Very tiny amount

Irascible

Easily angered

Iridescent

showing many colors

Irresolvable

Unable to be resolved

Irreverent

Disrespectful

Irrevocable

Conclusive

Itinerate

Wandering from place to place

Itinerary

Route of a traveler's journey

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