| quack(noun, verb, ululation, ululate) |
| ridiculous(adjective, silly, foolish, stupid, unwise) |
| round the bend(expression, idiom, silly, foolish, mad) |
| squawk(noun, verb, ululation, ululate) |
| twat |
| twit(noun, verb, ululation, ululate) |
| unhinged(adjective, silly, foolish, stupid, crazy) |
| absurd(adjective, silly, foolish, unwise) |
| asinine |
| brainsick(adjective, crazy, confused, insane, irrational) |
| buggy(adjective, slang, sane) |
| certifiable |
| crack-brained |
| disordered(adjective, wrong, confused, insane, irrational) |
| fool(adjective, crazy, zany, comical, schtick) |
| loopy |
| ludicrous(adjective, silly, foolish, unwise) |
| maniac(noun, adjective, crazy, mad, confused) |
| moonstruck(adjective, silly, foolish, stupid, mad) |
| schizo(noun, adjective, slang, silly, mad) |