| demented(adjective, silly, foolish, crazy) |
| mental(noun, adjective, slang, silly) |
| round the bend(expression, idiom, silly, foolish) |
| schizo(noun, slang, silly, foolish) |
| bats in the belfry(expression, idiom, silly, foolish) |
| flipped(silly, foolish, insane, unwise) |
| flipped out(expression, silly, foolish, crazy) |
| freaked out(expression, silly, foolish, insane) |
| fruity(silly, foolish, insane, unwise) |
| idiotic(adjective, silly, foolish, insane) |
| mad as a March hare(expression, idiom, silly, foolish) |
| mad as a hatter(expression, idiom, silly, foolish) |
| mentally strange(expression, silly, foolish, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish) |
| of unsound mind(expression, idiom, silly, foolish) |
| out to lunch(expression, adjective, idiom, silly, crazy) |
| screw loose(expression, silly, foolish, insane) |
| ape(silly, foolish, crazy, insane) |
| berserk(silly, foolish, crazy, insane) |
| cracked(adjective, silly, foolish, crazy) |