| certifiable(adjective, deranged) |
| daft(adjective, silly, foolish, stupid, crazy) |
| non compos mentis(expression, adjective, idiom, crazy, mad) |
| psychopathic(adjective, silly, foolish, stupid, crazy) |
| unhinged(adjective, silly, foolish, stupid, unstable) |
| bonkers |
| mentally ill(expression, adjective, idiom, mad, insane) |
| nut(noun, mad, patient, cuckoo, lunatic) |
| of unsound mind(expression, adjective, idiom, foolish, stupid) |
| cracked(adjective, silly, foolish, stupid, crazy) |
| disturbed(adjective, crazy, mad, unstable, troubled) |
| loco(adjective, crazy, mad, insane, crazed) |
| screwy(adjective, silly, foolish, stupid, crazy) |
| unsound(crazy, mad, unstable, insane, disturbed) |
| bedlamite(noun, person, madness, insanity, psycho) |
| crazed(adjective, silly, foolish, stupid, crazy) |
| kooky(adjective, crazy, mad, unstable, insane) |
| not all there(expression, adjective, idiom, unstable, disturbed) |
| schizoid(adjective, crazy, mad, insane, hysterical) |
| sick(adjective, deranged) |