| psycho(noun, adjective, slang, silly) |
| cuckoo(noun, adjective, slang, silly) |
| insane(adjective, silly, foolish, unwise) |
| mental(noun, adjective, slang, silly) |
| nuts(noun, adjective, slang, silly) |
| lunatic(noun, adjective, silly, foolish) |
| of unsound mind(expression, adjective, idiom, wild, silly) |
| potty(adjective, wild, silly, foolish) |
| screwball(noun, adjective, slang, silly) |
| barmy(adjective, silly, foolish, insane) |
| bats in the belfry(expression, adjective, idiom, wild, silly) |
| batty(adjective, silly, foolish, insane) |
| bonkers(adjective, silly, foolish, insane) |
| crazed(adjective, silly, foolish, insane) |
| daft(adjective, silly, foolish, insane) |
| demented(adjective, silly, foolish, insane) |
| deranged(adjective, silly, foolish, insane) |
| flipped out(expression, adjective, silly, foolish) |
| freaked out(expression, adjective, silly, foolish) |
| kooky(adjective, silly, foolish, insane) |