| crazy(adjective, upset, concern, informal, wild) |
| nutty(noun, adjective, slang, wild, strange) |
| insane(adjective, wild, silly, foolish, stupid) |
| daft(adjective, wild, strange, silly, foolish) |
| batty(noun, adjective, slang, wild, silly) |
| bonkers(adjective, slang, informal, crazy) |
| loony(adjective, slang, informal, wild, strange) |
| loco(noun, adjective, slang, crazy) |
| barmy(adjective, silly, foolish, crazy) |
| cracked(adjective, informal, wild, silly, foolish) |
| demented(adjective, wild, strange, silly, foolish) |
| unbalanced(adjective, silly, foolish, crazy) |
| mental(adjective, slang, silly, foolish, crazy) |
| screwy(adjective, slang, wild, silly, foolish) |
| cuckoo(adjective, slang, silly, crazy) |
| wacky(adjective, slang, wild, silly, foolish) |
| deranged(adjective, wild, silly, foolish, stupid) |
| lunatic(adjective, wild, silly, foolish, stupid) |
| daffy(adjective, slang, informal, silly, foolish) |
| kooky(adjective, wild, silly, foolish, crazy) |