| inapt(insignificant, unimportant, trivial, inappropriate, ridiculous) |
| incidental(insignificant, unimportant, irrelevant, superfluous, unconnected) |
| incongruous(adjective, silly, stupid, insignificant, confused) |
| inconsistent(adjective, simple, silly, foolish, stupid) |
| indolent |
| inoperable(impractical, hopeless, unusable) |
| inoperative(adjective, weak, stupid, idle, useless) |
| insane |
| insensible |
| insubstantial(adjective, value, insignificant, unimportant, empty) |
| lifeless(adjective, dull, weak, dry, boring) |
| ludicrous(adjective, dull, simple, slow, silly) |
| malapropos(ridiculous, absurd) |
| minor(adjective, silly, foolish, unimportant, trivial) |
| needless |
| no-account(adjective, poor, base, inferior, insignificant) |
| no-good(adjective, poor, base, inferior, insignificant) |
| no good(weak, poor, stupid, inferior, idle) |
| nutty(adjective, silly, stupid, insignificant, ridiculous) |
| of no use(expression, idiom, weak, stupid, idle) |