| loony(adjective, silly, foolish, fantastic, unwise) |
| ludicrous(adjective, silly, foolish, fantastic, unwise) |
| nonsensical(adjective, silly, foolish, fantastic, unwise) |
| odd(adjective, silly, foolish, fantastic, unwise) |
| out of all reason(expression, adjective, idiom, wild, strange) |
| outrageous(adjective, silly, foolish, fantastic, unwise) |
| peculiar(adjective, silly, foolish, fantastic, unwise) |
| preposterous(adjective, silly, foolish, fantastic, unwise) |
| puerile(adjective, silly, foolish, fantastic, unwise) |
| quixotic(adjective, silly, foolish, fantastic, unwise) |
| ridiculous(adjective, silly, foolish, fantastic, unwise) |
| senseless(adjective, silly, foolish, fantastic, unwise) |
| short-sighted(adjective, silly, foolish, fantastic, unwise) |
| silly(adjective, foolish, fantastic, unwise, impractical) |
| strange(adjective, silly, foolish, fantastic, unwise) |
| unworkable(adjective, silly, foolish, fantastic, unwise) |
| weird(adjective, silly, foolish, fantastic, unwise) |
| ape(silly, foolish, unwise) |
| backward(impractical, half-baked, doomed) |
| barmy(silly, foolish, unwise) |