| crazy(adjective, weak, simple, strange, silly) |
| nutty(noun, adjective, weak, simple, slang) |
| mad(adjective, weak, simple, silly, foolish) |
| loony(adjective, weak, simple, informal, strange) |
| nuts(noun, adjective, wrong, slang, strange) |
| daft(adjective, weak, simple, strange, silly) |
| batty(noun, adjective, wrong, slang, wild) |
| goofy(adjective, informal, silly, foolish, crazy) |
| barmy |
| insane(adjective, weak, simple, silly, foolish) |
| screwy(adjective, slang, sane, eccentric) |
| wacky(adjective, weak, simple, slang, silly) |
| balmy(adjective, stupid, crazy, insane) |
| foolish(adjective, weak, simple, strange, silly) |
| bonkers(adjective, informal, sane) |
| cracked(adjective, wrong, informal, stupid, crazy) |
| crackers(adjective, silly, crazy, sick, off) |
| cuckoo(adjective, wrong, slang, wild, crazy) |
| loco(adjective, slang, crazy, sick, insane) |
| loopy(adjective, foolish) |