| insane(adjective, wild, silly, foolish, stupid) |
| crazy(adjective, informal, unusual, wild, strange) |
| daft(adjective, wild, silly, foolish, stupid) |
| affected(verb, adjective, easy, keen, sympathetic) |
| mad(adjective, unusual, wild, strange, silly) |
| nutty(adjective, slang, wild, silly, foolish) |
| cracked(adjective, informal, wild, silly, foolish) |
| demented(adjective, unusual, wild, strange, silly) |
| unbalanced(adjective, silly, foolish, crazy, mad) |
| deranged(adjective, wild, silly, foolish, stupid) |
| lunatic(adjective, wild, silly, foolish, stupid) |
| unhinged(adjective, silly, foolish, crazy, mad) |
| screwy(adjective, state, simple, slang, silly) |
| batty(adjective, slang, wild, silly, foolish) |
| loony(adjective, wrong, informal, wild, silly) |
| moved(verb, adjective, keen, sympathetic, excited) |
| non compos mentis(expression, adjective, idiom, law, unstable) |
| nuts(adjective, slang, wild, silly, foolish) |
| of unsound mind(expression, adjective, idiom, silly, mad) |
| bonkers(adjective, informal, silly, foolish, crazy) |