| A | B |
|---|
| Idle | Inactive, unused, inert, lazy |
| Illusion | Fantasy, delusion, an erroneous perception or concept |
| Illustration | Picture, drawing, description |
| Imaginary | Unreal, fantastic, fictitious |
| Imaginative | Creative, original, clever |
| Immense | Huge, enormous, massive, colossal |
| Impair | Damage, injure, spoil, interfere with |
| Impartial | Fair, unbiased, neutral |
| Implement | Realize, achieve, put into practice, execute, tool, utensil |
| Incessant | Constant, ceaseless, continuous |
| Increment | Increase, amount |
| Incursion | Raid, attack, small scale invasion |
| Indifferent | Uncaring, apathetic, unconcerned |
| Indigenous | Native |
| Indispensable | Necessary, essential, vital, critical |
| Indistinct | Unclear, blurry, hazy, fuzzy |
| Induce | Persuade, convince, coax |
| Inept | Incompetent, awkward, clumsy |
| Inexorable | Unstoppable |
| Infamous | Notorious, shocking |
| Infinite | Limitless, endless, boundless |
| Infinitesimal | Tiny, minute, miniscule |
| Ingenious | Brilliant, imaginative, clever, inventive |
| Ingenuous | Naive, trusting, gullible |
| Inhabit | Live, dwell, reside, populate |
| Inhibit | Control, limit, restrain |
| Initial | Original, first, beginning, introductory |
| Innate | Natural, inborn |
| Innocuous | Harmless, inoffensive |
| Intense | Powerful, heightened, concentrated |
| Intricate | Complicated, complex, involved |
| Involved | Complicated, intricate, complex, elaborate |
| Irate | Angry, annoyed, upset |
|
