| mad as a March hare(expression, idiom, silly, foolish, mad) |
| mad as a hatter(expression, idiom, silly, foolish, mad) |
| mentally strange(expression, silly, foolish, mad, insane) |
| moronic(weak, simple, silly, foolish, thoughtless) |
| nonsensical(adjective, weak, simple, silly, foolish) |
| not all there(expression, adjective, unstable, disturbed, erratic) |
| nutty as fruitcake(expression, idiom, silly, foolish, mad) |
| out-of-the-way |
| rare |
| ridiculous(adjective, weak, simple, wrong, wild) |
| rummy(adjective, beat, wild, crazy, usual) |
| schizo(adjective, silly, foolish, mad, insane) |
| screw loose(expression, silly, foolish, mad, insane) |
| stupid(weak, simple, silly, foolish, crazy) |
| thoughtless(wild, silly, unwise, irresponsible) |
| tomfool(adjective, foolish) |
| unbelievable(adjective, extraordinary, amazing, incredible) |
| unexpected(adjective, unusual, strange) |
| unreasonable(adjective, weak, simple, silly, foolish) |
| unwise(weak, simple, silly, foolish, unreasonable) |