| mad as a hatter(expression, adjective, idiom, silly) |
| mentally strange(expression, silly, foolish, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish) |
| round the bend(expression, idiom, silly, foolish) |
| schizo(adjective, silly, foolish, insane) |
| screw loose(expression, silly, foolish, insane) |
| stupid(adjective, mind, think, silly, foolish) |
| ape(silly, foolish, crazy, insane) |
| dingy(silly, foolish, insane, unwise) |
| dippy(silly, foolish, crazy, insane) |
| erratic(silly, foolish, insane, unwise) |
| flaky(silly, foolish, crazy, insane) |
| flipped(silly, foolish, hot, crazy) |
| preposterous(silly, foolish, stupid, crazy) |
| screwball(silly, foolish, crazy, insane) |
| silly(foolish, stupid, crazy, insane) |
| unglued(silly, foolish, crazy, insane) |
| unzipped(silly, foolish, crazy, insane) |
| absurd(silly, foolish, crazy, unwise) |
| aper(silly, insane) |