| vacuous(adjective, characteristic, informal, careless, indifferent) |
| imprudent(adjective, characteristic, weak, simple, careless) |
| harebrained(adjective, characteristic, weak, simple, knowledge) |
| illogical(adjective, characteristic, wrong, foolish, stupid) |
| nutty(adjective, light, weak, simple, wrong) |
| ignorant(adjective, characteristic, slight, detail, foolish) |
| immature(adjective, characteristic, foolish, innocent, absurd) |
| nitwitted(adjective, characteristic, foolish, stupid, senseless) |
| trivial(adjective, characteristic, slight, detail, small) |
| unintelligent(adjective, characteristic, weak, simple, slight) |
| balmy(adjective, characteristic, knowledge, slang, ability) |
| featherbrained(adjective, characteristic, ability, foolish, absurd) |
| simpleminded(adjective, characteristic, foolish, stupid, senseless) |
| wacky(adjective, light, weak, simple, wrong) |
| foolhardy(adjective, characteristic, foolish, crazy, fantastic) |
| impractical(adjective, characteristic, foolish, stupid, trivial) |
| inappropriate(adjective, characteristic, foolish, fantastic, rash) |
| inconsistent(adjective, characteristic, wrong, foolish, stupid) |
| muddle-headed(adjective, characteristic, foolish, absurd, stupidity) |
| farcical(adjective, characteristic, ridiculous, absurd, stupidity) |