| crazy(noun, adjective, wild, strange, silly) |
| psycho(noun, adjective, slang, silly, mad) |
| loony(noun, adjective, slang, foolish, sick) |
| cuckoo(noun, adjective, slang, silly, mad) |
| insane(adjective, silly, foolish, mad, unwise) |
| mental(noun, adjective, slang, silly, mad) |
| nuts(noun, adjective, slang, silly, mad) |
| psychotic(noun, adjective) |
| schizoid(adjective, strange, crazy, absurd, wacky) |
| schizophrenic(noun, adjective) |
| lunatic(noun, adjective, silly, foolish, mad) |
| of unsound mind(expression, adjective, idiom, wild, silly) |
| potty(adjective, wild, silly, foolish, mad) |
| screwball(noun, adjective, slang, silly, mad) |
| barmy(adjective, silly, foolish, mad, insane) |
| bats in the belfry(expression, adjective, idiom, wild, silly) |
| batty(adjective, silly, foolish, mad, insane) |
| bonkers(adjective, silly, foolish, mad, insane) |
| crazed(adjective, silly, foolish, mad, insane) |
| daft(adjective, silly, foolish, mad, insane) |