| Term | Definition |
|---|
| infringe | violate; encroach |
| ingenious | clever; resourceful; creative; innovative |
| ingenuous | naive and trusting; unsophisticated; young |
| ingrained | deeply established; firmly rooted |
| ingrate | ungrateful person |
| ingratiate | become popular with |
| inherent | firmly established by nature or habitat |
| inhibit | restrain; retard or prevent |
| inimical | unfriendly; hostile; harmful; detrimental |
| inimitable | matchless; not able to be imitated |
| iniquitous | wicked; immoral; unrighteous |
| initiate | begin; originate; receive into a group |
| injurious | harmful |
| inkling | hint |
| innate | inborn |
| innocuous | harmless |
| innovation | change; introduction of something new |
| innuendo | hint; insinuation |
| inopportune | untimely; poorly chosen |
| inordinate | unrestrained; excessive |
| inquisitor | questioner (especially harsh); investigator |
| insalubrious | unwholesome; not healthful; not sustaining or promoting health |
| insatiable | not easily satisfied; unquenchable; greedy |
| inscrutable | impenetrable; not easily understood; mysterous |
| insensate | without feeling |
| insensible | unconscious; unresponsive |
| insidious | treacherous; stealthy; sly |
| insightful | discerning; perceptive |
| insinuate | hint; imply; creep in |
| insipid | lacking in flavor; dull |
| insolvent | bankrupt; lacking money to pay; Unable to meet debts or discharge liabilities |
| insomnia | wakefulness; inability to sleep |
| insouciant | indifferent; without concern or care |
| instigate | urge; start; provoke |
| insubordination | disobedience; rebelliousness |
| insubstantial | lacking substance; insignificant; frail |
| insularity | narrow-mindedness; isolation |
| insuperable | insurmountable; unbeatable |
| insurgent | rebellious |
| insurmountable | overwhelming; unbeatable; insuperable |
| insurrection | rebellion; uprising |
| intangible | not able to be perceived by touch; vague |
| integral | complete; necessary for completeness |
| integrate | make whole; combine; make into one unit |
| integrity | uprightness; wholeness |
| intellect | higher mental powers |
| intelligentsia | intellectual; members of the educated elite (often used derogatorily) |
| inter | bury |
| interdict | prohibit; forbid |
| interim | meantime |
| interloper | intruder |
| interminable | endless |
| intermittent | periodic; on and off |
| internecine | mutually destructive |
| interpolate | insert between |
| interregnum | period between two reigns |
| interrogate | question closely; cross examine |
| intervene | come between |
| intimate (v) | hint; to make known subtly and indirectly |
| intimidate | frighten |
| intractable | unruly; stubborn; unyielding |
| intransigence | refusal of any compromise; stubbornness |
| intrepid | fearless |
| intrinsic | essential; inherent; built in |
| introspective | looking within oneself |
| introvert | one who is introspective; inclined to think more about oneself |
| intrude | trespass; enter as an uninvited person |
| intuition | immediate insight; power of knowing without reasoning |
| inundate | overwhelm; flood; submerge |
| inured | accustomed; hardened |
| invalidate | weaken; destroy |
| invective | abuse |
| inveigh | denounce; utter censure or invective |
| inveigle | To win over by coaxing, flattery, or artful talk; lead astray; wheedle |
| inverse | opposite |
| invert | turn upside down or inside out |
Combine with other sets
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