| insane(adjective, foolish, stupid, crazy) |
| lunatic(noun, adjective, person, crazy) |
| crazy(noun, adjective, person, foolish, stupid) |
| deranged(noun, adjective, crazy, unstable) |
| psycho(noun, adjective, person, crazy) |
| demented(noun, adjective, crazy, unstable) |
| maniac(noun, adjective, person, crazy) |
| unbalanced(adjective, unstable, insane, disturbed) |
| crackpot(noun, adjective, person, madness) |
| nuts(noun, adjective, silly, foolish, stupid) |
| psychopath(noun, person, madness, insanity) |
| kook(noun, person, madness, insanity) |
| maniacal(adjective, silly, foolish, stupid, crazy) |
| neurotic(noun, adjective, troubled, insane) |
| nutty(adjective, silly, foolish, stupid, crazy) |
| daft(adjective, silly, foolish, stupid, crazy) |
| non compos mentis(expression, adjective, idiom, crazy) |
| psychopathic(adjective, silly, foolish, stupid, crazy) |
| mentally ill(expression, adjective, idiom, insane) |
| nut(noun, patient, cuckoo, lunatic) |