| insane(adjective, wild, silly, foolish, stupid) |
| crazy(adjective, light, wild, strange, silly) |
| mad(adjective, wild, silly, foolish, stupid) |
| nutty(noun, adjective, light, slang, wild) |
| daft(adjective, wild, silly, foolish, stupid) |
| nuts(noun, adjective, slang, wild, silly) |
| loony(adjective, light, informal, wild, silly) |
| bonkers(adjective, informal, wild, silly, crazy) |
| demented(adjective, wild, silly, foolish, stupid) |
| screwy(adjective, light, slang, silly, crazy) |
| barmy(adjective, silly, foolish, crazy, mad) |
| dotty(noun, adjective, wrong, wild, crazy) |
| lunatic(adjective, wild, silly, foolish, stupid) |
| unbalanced(adjective, silly, foolish, crazy, mad) |
| wacky(adjective, light, slang, wild, silly) |
| balmy(adjective, silly, foolish, unwise, impractical) |
| cracked(adjective, informal, wild, silly, foolish) |
| deranged(adjective, wild, silly, foolish, stupid) |
| cuckoo(adjective, slang, wild, silly, foolish) |
| kooky(adjective, wild, silly, foolish, crazy) |