invalidate

weaken; destroy; make invalid; nullify

The cheque was invalidated because of overwriting

invective
abuse

The world will be able to judge of his [Junius'] motives for writing such famous invectives. –Sir W. Draper

inveigh
denounce; utter censure or invective

Inveigh against the evils of drink

inveigle
deceive; lead astray by deception; wheedle(cajole);

He inveigled her into joining the club

inverse
opposite

The recession hit the growing market inversely

inveterate
deep-rooted; habitual; CF. grow old

He is an inveterate liar

invidious
designed to create ill will or envy; tending to rouse ill will or envy; Ex. invidious comparison

invincible
unconquerable

She has an invincible spirit

inviolable
secure from corruption, attack, or violation(or profanation); unassailable

He tried a third, a tough, well-chosen spear, The inviolable body stood sincere. –Dryden

invocation
prayer for help (used in invoking); calling upon as a reference or support; act of invoking

The whole poem is a prayer to Fortune, and the invocation is divided between the two deities. –Addison

invulnerable
incapable of injury; impossible to damage or injure

The mountain stands invulnerable

iota
very small quantity

He does not give her an iota of importance

irascible
irritable; easily angered

He has an irascible temper

irate
angry; CF. ire: anger; wrath

An irate customer hurled money at the counter

iridescent
exhibiting rainbow like colors; Ex. iridescent oil slick; N. iridescence

The stone had iridescent hues

irksome
annoying; tedious; V. irk: annoy

An irksome child

ironic
expressing irony; occurring in an unexpected and contrary manner

He made an ironic remark

irreconcilable
impossible to reconcile; incompatible; not able to be resolved

The disputes were irreconcilable

irrefutable
indisputable; incontrovertible; undeniable

His candidature is irrefutable

irrelevant
not applicable; unrelated

The matter was irrelevant

irremediable
incurable; uncorrectable; impossible to remedy

An irremediable conduct

irreparable
not able to be corrected or repaired; impossible to repair

His mother’s loss was irreparable

irrepressible
unable to be restrained or held back; impossible to hold back

Irrepressible idea

irreproachable
beyond reproach; blameless; impeccable

His was an irreproachable conduct

irresolute
uncertain how to act; weak; lacking in resolution; indecisive; N. irresolution

Hamlet was irresolute

indecisive
marked by indecision; inconclusive;

An indecisive battle

irretrievable
impossible to recover or regain; CF. retrieve

The files are irretrievable

irreverence
lack of proper respect or reverence; ADJ. irreverent

His irreverence was obvious

irrevocable
unalterable; irreversible; impossible to revoke

The rules of the institution are irrevocable

isotope
varying from of an element

Carbon has many isotopic forms

isthmus
narrow neck of land connecting two larger bodies of land

The Isthmus of Suez

itinerant
wandering; traveling from place to place (to perform work);

Buddha was an itinerant preacher

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