| bonkers(adjective, slang, informal, crazy) |
| nuts(adjective, slang, crazy, sane) |
| batty(noun, adjective, slang, crazy) |
| crazy(adjective, wild, insane, disturbed) |
| nutty(noun, adjective, slang, crazy) |
| loco(noun, adjective, slang, crazy) |
| loony(adjective, informal, crazy, sane) |
| lunatic(adjective, crazy, sane) |
| daffy(adjective, slang, informal, crazy) |
| dippy(adjective, slang, crazy) |
| maniac(adjective, crazy, insane, irrational) |
| psychotic(adjective, crazy, hysterical, crazed) |
| unsound(adjective, foolish, crazy, insane) |
| doolally(adjective, slang, crazy) |
| foolish(adjective, crazy, fantastic, hysterical) |
| irrational(adjective, crazy, insane, disturbed) |
| unscrewed(adjective, slang, crazy) |
| baked(crazy, insane, irrational, distracted) |
| bemused(adjective, wild, stupid, crazy) |
| cock-eyed(adjective, slang, crazy) |