| delirious(adjective, silly, foolish, crazy, mad) |
| doolally(adjective, slang, crazy, mad) |
| fatuous(adjective, silly, foolish, unwise) |
| flipped(silly, foolish, mad, insane, unwise) |
| flipped out(expression, silly, foolish, crazy, mad) |
| freaked out(expression, silly, foolish, crazy, mad) |
| idiotic(adjective, simple, silly, foolish, crazy) |
| irrational(adjective, silly, foolish, crazy, mad) |
| ludicrous(adjective, silly, foolish, unwise) |
| mad as a March hare(expression, idiom, silly, foolish, mad) |
| mad as a hatter(expression, adjective, idiom, silly, mad) |
| mentally strange(expression, silly, foolish, mad, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish, mad) |
| off-the-wall |
| off one's chump |
| pixilated(adjective, slang, crazy, mad) |
| preposterous(adjective, silly, foolish, crazy, mad) |
| psychopathic |
| raving |
| schizo(adjective, silly, foolish, mad, insane) |