| mad as a hatter(expression, idiom, silly, foolish) |
| mentally strange(expression, silly, foolish, insane) |
| nuts(silly, foolish, crazy, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish) |
| of unsound mind(expression, idiom, silly, foolish) |
| out to lunch(expression, idiom, silly, insane) |
| potty(silly, foolish, insane, unwise) |
| screw loose(expression, silly, foolish, insane) |
| screwball(silly, foolish, insane, unwise) |
| screwy(silly, foolish, insane, unwise) |
| wacky(silly, foolish, insane, unwise) |
| cracked(verb, silly, foolish, crazy) |
| daft(silly, foolish, insane, unwise) |
| demented(silly, foolish, hot, crazy) |
| dingy(silly, foolish, insane, unwise) |
| erratic(silly, foolish, insane, unwise) |
| idiotic(silly, foolish, insane, unwise) |
| lunatic(silly, foolish, hot, crazy) |
| maniacal(silly, foolish, hot, crazy) |
| mental(silly, foolish, insane, unwise) |