| unbalanced(adjective, silly, foolish, crazy, mad) |
| absurd(adjective, weak, simple, knowledge, ability) |
| neurotic(noun, adjective, person, mad, insane) |
| wacky(adjective, weak, simple, knowledge, slang) |
| balmy(adjective, knowledge, slang, ability, informal) |
| bonkers(adjective, informal, silly, foolish, crazy) |
| crank(noun, person, informal, crazy, mad) |
| cuckoo(noun, adjective, person, slang, wild) |
| delirious(adjective, wild, silly, foolish, crazy) |
| idiotic(adjective, weak, simple, knowledge, ability) |
| mental(adjective, simple, silly, foolish, mad) |
| non compos mentis(expression, adjective, idiom, law, foolish) |
| nut(noun, person, slang, informal, crazy) |
| nuts(noun, adjective, slang, wild, silly) |
| screwy(adjective, slang, wild, silly, foolish) |
| cracked(adjective, informal, wild, silly, foolish) |
| moonstruck(noun, adjective, silly, foolish, stupid) |
| of unsound mind(expression, adjective, idiom, silly, mad) |
| psychopath(noun, person, mad, madness, insanity) |
| touched(adjective, wild, silly, foolish, stupid) |