| potty(adjective, wild, silly, foolish, stupid) |
| screwball(noun, silly, foolish, crazy) |
| crackpot(noun, adjective, crazy, odd) |
| distraught(adjective, crazy, odd, insane) |
| flaky(adjective, light, wrong, unusual, wild) |
| harebrained(adjective, weak, simple, knowledge, ability) |
| of unsound mind(expression, adjective, idiom, silly) |
| off-the-wall(adjective, crazy, odd, insane) |
| psycho(noun, silly, foolish, crazy) |
| twisted(adjective, crazy, odd, insane) |
| delirious(adjective, crazy, odd, insane) |
| maniacal(adjective, silly, foolish, crazy) |
| unhinged(adjective, simple, silly, foolish) |
| mental(adjective, simple, silly, foolish) |
| moonstruck(adjective, silly, foolish, insane) |
| out to lunch(expression, adjective, idiom, silly, crazy) |
| rabid(adjective, keen, warm, passionate, excited) |
| unglued(adjective, crazy, odd, insane) |
| unusual(adjective, strange, silly, foolish, stupid) |
| bats in the belfry(expression, idiom, silly, foolish) |