| wacky(adjective, slang, silly, foolish, crazy) |
| bats(adjective, crazy) |
| cracked(adjective, informal, silly, foolish, crazy) |
| daffy(adjective, slang, informal, crazy, mad) |
| kooky(adjective, silly, foolish, crazy, mad) |
| loopy |
| touched(adjective, silly, foolish, crazy, mad) |
| fruity(adjective, slang, informal, silly, foolish) |
| mental(adjective, simple, silly, foolish, mad) |
| haywire(adjective, informal, crazy, broken) |
| psychotic |
| round the bend(expression, adjective, idiom, silly, foolish) |
| unhinged(adjective, silly, crazy, mad, insane) |
| buggy(adjective, slang, sane) |
| gaga(adjective, informal, crazy, sane) |
| non compos mentis(adjective, law, sane) |
| of unsound mind(expression, adjective, idiom, silly, mad) |
| brainsick(adjective, informal, insane, sane) |
| certifiable |
| crazed(adjective, wild, silly, foolish, crazy) |