| importless |
| impossible(adjective, absurd) |
| impotent |
| impracticable(weak, stupid, idle, useless, incompetent) |
| impractical(weak, stupid, idle, useless, incompetent) |
| inapplicable(insignificant, unimportant, trivial, inconsequential, irrelevant) |
| inapposite(insignificant, unimportant, trivial, inconsequential, irrelevant) |
| inappreciable(adjective, slight, small, insignificant, unimportant) |
| inappropriate(stupid, insignificant, unimportant, trivial, absurd) |
| inchoate |
| incompetent(weak, careless, stupid, idle, feeble) |
| inconsiderate(insignificant, unimportant, trivial, inconsequential, irrelevant) |
| indifferent(adjective, slight, lower, value, inferior) |
| inefficient |
| inessential(adjective, insignificant, unimportant, trivial, senseless) |
| inexpressive |
| inoperative(adjective, weak, stupid, idle, innocent) |
| insincere(adjective, empty, worthless, throwaway) |
| irrelative(insignificant, unimportant, trivial, inconsequential, irrelevant) |
| irresponsible(weak, careless, stupid, feeble, absurd) |