| kooky(adjective, weak, simple, wrong, wild) |
| loopy(adjective, knowledge, ability, informal, foolish) |
| nuts(adjective, simple, wild, strange, silly) |
| oddball(adjective, strange, crazy, ridiculous) |
| off the wall(expression, adjective, idiom, light, unusual) |
| rash(adjective, crazy, mad, odd, insane) |
| unearthly(adjective, knowledge, ability) |
| unimaginable(adjective, unreasonable, useless, doubtful, dubious) |
| unrealistic(adjective, happy, wild, silly, foolish) |
| abnormal(adjective, strange, unreasonable, fantastic, ugly) |
| anomalous |
| barmy(adjective, crazy, mad, odd, insane) |
| beyond belief(expression, adjective, idiom, unusual, unreasonable) |
| contradictory(adjective, strange, foolish, stupid, odd) |
| cuckoo(adjective, silly, foolish, unwise) |
| doltish(adjective, weak, simple, silly, foolish) |
| dopey(adjective, knowledge, slang, ability, foolish) |
| doubtful(adjective, dubious, improbable) |
| empty(adjective, simple, value, silly, stupid) |
| extraordinary |