| fruity(adjective, silly, foolish, insane) |
| schizo(noun, adjective, slang, silly) |
| potty(adjective, silly, foolish, insane) |
| moonstruck(adjective, silly, foolish, stupid) |
| kooky(adjective, silly, foolish, crazy) |
| maniacal(adjective, silly, foolish, stupid, crazy) |
| screwball(noun, adjective, slang, silly) |
| wacky(adjective, simple, silly, foolish) |
| bats in the belfry(expression, idiom, silly, foolish) |
| berserk(adjective, silly, foolish, crazy) |
| delirious(adjective, silly, foolish, crazy) |
| dippy(adjective, silly, foolish, insane) |
| 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, idiom, silly, foolish) |
| mentally strange(expression, silly, foolish, insane) |
| nutty as fruitcake(expression, idiom, silly, foolish) |
| round the bend(expression, idiom, silly, foolish) |
| screw loose(expression, silly, foolish, insane) |