| psycho(adjective, silly, foolish, crazy) |
| ridiculous(adjective, light, wild, silly, foolish) |
| screwball(adjective, silly, foolish, crazy) |
| bats in the belfry(expression, idiom, silly, foolish) |
| bedlamite(adjective, keen, warm, silly, foolish) |
| erratic(silly, foolish, unstable, insane) |
| flipped(silly, foolish, insane, unwise) |
| flipped out(expression, silly, foolish, crazy) |
| freaked out(expression, silly, foolish, insane) |
| mad as a March hare(expression, idiom, silly, foolish) |
| mad as a hatter(expression, adjective, idiom, silly, foolish) |
| mentally strange(expression, silly, foolish, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish) |
| schizo(adjective, silly, foolish, insane) |
| screw loose(expression, silly, foolish, insane) |
| ape(silly, foolish, crazy, insane) |
| dingy(silly, foolish, insane, unwise) |
| harebrained(adjective, keen, warm, slow, wild) |
| unglued(silly, foolish, unstable, insane) |
| unzipped(silly, foolish, insane, unwise) |