| half-baked(silly, foolish, unwise) |
| harebrained(silly, foolish, unwise) |
| ill-conceived(adjective, wild, silly, foolish, senseless) |
| impracticable(silly, foolish, unwise) |
| impractical(adjective, wrong, wild) |
| imprudent(silly, foolish, unwise) |
| inane(silly, foolish, unwise) |
| inappropriate(silly, foolish, unwise) |
| irrational(adjective, wrong, wild, silly, foolish) |
| irresponsible(adjective, wrong, wild, silly, foolish) |
| ludicrous(silly, foolish, unwise) |
| masculine(unglued, well-built, potty) |
| non compos mentis(adjective, law, sane) |
| nonsensical(silly, foolish, unwise) |
| odd(silly, foolish, unwise) |
| out of all reason(expression, adjective, idiom, wild, silly) |
| outlandish(silly, foolish, unwise) |
| outrageous(silly, foolish, unwise) |
| peculiar(silly, foolish, unwise) |
| preposterous(adjective, wrong, wild, silly, foolish) |