| 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) |
| loco(adjective, sick, hacked, lunatic, crackbrained) |
| loony(adjective, silly, foolish, unwise, off) |
| ludicrous(silly, foolish, unwise) |
| maniac(adjective, crazy, hysterical, hacked, lunatic) |
| masculine(unglued, well-built, potty) |
| mentally ill(expression, adjective, sick, crackers) |
| nonsensical(silly, foolish, unwise) |
| odd(silly, foolish, unwise) |
| off |
| 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) |