| mentally strange(expression, adjective, silly, foolish) |
| nutty as fruitcake(expression, adjective, idiom, wild, silly) |
| of unsound mind(expression, adjective, idiom, wild, silly) |
| out to lunch(expression, adjective, idiom, wild, silly) |
| schizo(adjective, wild, silly, foolish) |
| screw loose(expression, adjective, wild, silly, foolish) |
| screwball(adjective, silly, foolish, insane) |
| screwy(adjective, silly, foolish, insane) |
| unglued(adjective, wild, silly, foolish) |
| ape(adjective, silly, foolish, insane) |
| aper(adjective, silly, confused, insane) |
| barking mad(expression, crazy, insane) |
| being rash and foolish(expression, crazy, insane) |
| berserk(adjective, silly, foolish, insane) |
| buck wild(expression, crazy, insane) |
| crazed(adjective, silly, foolish, insane) |
| delirious(adjective, silly, foolish, insane) |
| demented(adjective, silly, foolish, insane) |
| deranged(adjective, silly, foolish, insane) |
| dingy(adjective, silly, foolish, insane) |