| demented(adjective, silly, foolish, crazy) |
| fruity(adjective, silly, foolish, insane) |
| potty(adjective, silly, foolish, insane) |
| unbalanced(adjective, silly, foolish, crazy) |
| unhinged(adjective, silly, foolish, insane) |
| out to lunch(expression, adjective, idiom, silly) |
| touched(adjective, silly, foolish, crazy) |
| crackpot(adjective, crazy, odd, insane) |
| dippy(adjective, silly, foolish, insane) |
| odd(adjective, crazy, insane) |
| of unsound mind(expression, adjective, idiom, silly) |
| senseless(adjective, crazy, odd, insane) |
| absurd(adjective, crazy, odd, insane) |
| delirious(adjective, crazy, odd, insane) |
| flaky(adjective, silly, foolish, crazy) |
| maniacal(adjective, silly, foolish, crazy) |
| nonsensical(adjective, crazy, odd, insane) |
| off-the-wall(adjective, crazy, odd, insane) |
| screwball(adjective, silly, foolish, crazy) |
| silly(adjective, foolish, crazy, trivial) |