| crazy(adjective, informal, wild, strange, foolish) |
| nuts(adjective, slang, crazy, mad, sane) |
| batty(adjective, slang, silly, crazy, mad) |
| mad(adjective, silly, foolish, crazy, insane) |
| loony(adjective, informal, silly, foolish, crazy) |
| nutty(adjective, slang, crazy, mad, sane) |
| insane(adjective, silly, foolish, crazy, mad) |
| daft(adjective, silly, stupid, crazy, mad) |
| barmy(adjective, silly, foolish, crazy, mad) |
| balmy(adjective, silly, foolish, crazy, mad) |
| loco(adjective, slang, crazy, mad, sane) |
| unbalanced(adjective, silly, foolish, crazy, mad) |
| lunatic(adjective, informal, silly, foolish, crazy) |
| screwy(adjective, slang, silly, foolish, crazy) |
| dotty(adjective, sane) |
| bananas(adjective, slang, crazy, mad, sane) |
| crackers(adjective, sane) |
| cuckoo(adjective, slang, silly, foolish, crazy) |
| demented(adjective, silly, foolish, crazy, mad) |
| deranged(adjective, simple, silly, foolish, crazy) |