| lunatic(noun, adjective, wild, silly, foolish) |
| cuckoo(noun, adjective, slang, silly, crazy) |
| nutty(adjective, silly, foolish, crazy) |
| kooky(adjective, slang, silly, foolish, crazy) |
| screwy(adjective, silly, foolish, crazy) |
| nuts(noun, adjective, slang, silly) |
| psycho(noun, slang, silly, sick) |
| daft(adjective, silly, foolish, crazy) |
| dippy(adjective, silly, foolish, insane) |
| erratic(adjective, silly, foolish, usual) |
| insane(adjective, silly, foolish, crazy) |
| wacky(adjective, silly, foolish, crazy) |
| barmy(adjective, silly, foolish, crazy) |
| flaky(adjective, silly, foolish, crazy) |
| potty(adjective, silly, foolish, insane) |
| silly(adjective, foolish, crazy, insane) |
| unbalanced(adjective, silly, foolish, crazy) |
| unhinged(adjective, silly, foolish, insane) |
| batty(adjective, silly, foolish, crazy) |
| bonkers(adjective, silly, foolish, crazy) |