| slow-witted(adjective, mind, think) |
| thick(adjective, dull, simple, slow, silly) |
| unwise(adjective, weak, simple, wild, silly) |
| weak-minded(adjective, mind, think) |
| babbling |
| barmy(adjective, silly, foolish, mad, trivial) |
| bizarre(adjective, wild, strange, silly, foolish) |
| blithering(adjective, foolish) |
| boneheaded(adjective, silly, impulsive, impractical, unintelligent) |
| cracked(adjective, wild, silly, foolish, stupid) |
| dizzy |
| driveling |
| eccentric(adjective, silly, foolish, fantastic, absurd) |
| fatuitous |
| flaky(adjective, wild, silly, foolish, stupid) |
| gormless |
| ignorant(adjective, simple, slow, silly, foolish) |
| inconsistent(adjective, simple, silly, stupid, insignificant) |
| jerky(adjective, weak, simple, knowledge, slang) |
| loopy(adjective, knowledge, ability, informal, foolish) |