| insane(adjective, silly, foolish, stupid) |
| lunatic(adjective, silly, foolish, stupid) |
| demented(adjective, silly, foolish, stupid) |
| daft(adjective, silly, foolish, stupid) |
| deranged(adjective, silly, foolish, stupid) |
| touched(adjective, informal, silly, foolish, stupid) |
| cracked(adjective, informal, silly, foolish, stupid) |
| crazed(adjective, silly, foolish, stupid) |
| mental(adjective, silly, foolish, stupid) |
| of unsound mind(expression, adjective, idiom, silly) |
| unbalanced(adjective, silly, foolish, insane) |
| fruity(adjective, slang, silly, foolish) |
| nuts(adjective, slang, silly, foolish, stupid) |
| nutty(adjective, slang, silly, foolish, stupid) |
| psycho(silly, foolish, insane, unwise) |
| unhinged(adjective, silly, foolish, stupid) |
| batty(adjective, slang, silly, foolish, stupid) |
| bonkers(adjective, informal, silly, foolish) |
| maniacal(adjective, silly, foolish, stupid) |
| cuckoo(adjective, slang, silly, foolish, stupid) |