| bats in the belfry(expression, idiom, silly, foolish, mad) |
| bedlamite(adjective, keen, warm, silly, foolish) |
| bizarre(adjective, wrong, wild, silly, foolish) |
| cockeyed(silly, foolish, unwise, impractical, half-baked) |
| erratic(silly, foolish, mad, unstable, insane) |
| flipped(silly, foolish, mad, insane, unwise) |
| flipped out(expression, silly, foolish, crazy, mad) |
| freaked out(expression, silly, foolish, mad, insane) |
| futile(adjective, ridiculous, absurd, pointless, vain) |
| hysterical(adjective, insane) |
| incongruous(adjective, silly, stupid, insignificant, unreasonable) |
| infatuated |
| kinky(adjective, unstable, disturbed, erratic, unhinged) |
| mad as a March hare(expression, idiom, silly, foolish, mad) |
| mad as a hatter(expression, adjective, idiom, silly, foolish) |
| mentally strange(expression, silly, foolish, mad, insane) |
| mindless(adjective, silly, stupid, insignificant, unreasonable) |
| nutty as fruitcake(expression, idiom, silly, foolish, mad) |
| oddball(adjective, eccentric) |
| off-the-wall |