| crazy(adjective, characteristic, person, light, weak) |
| mad(adjective, characteristic, person, weak, simple) |
| loony(adjective, light, weak, simple, wrong) |
| daft(adjective, weak, simple, wild, silly) |
| absurd(adjective, light, weak, simple, wrong) |
| balmy(adjective, knowledge, slang, ability, wild) |
| lunatic(adjective, weak, simple, knowledge, ability) |
| barmy(adjective, crazy, mad, insane) |
| nonsensical(adjective, weak, simple, wrong, knowledge) |
| kooky(adjective, weak, simple, wrong, unusual) |
| loopy(adjective, knowledge, ability, informal, foolish) |
| crazed(adjective, wild, silly, foolish, stupid) |
| eccentric(adjective, characteristic, person, unusual, wild) |
| queer(adjective, characteristic, person, informal, unusual) |
| senseless(adjective, weak, simple, wrong, informal) |
| oddball(noun, adjective, characteristic, person, unusual) |
| wild(adjective, wrong, strange, silly, foolish) |
| witless(adjective, informal, foolish, crazy, mad) |
| peculiar(adjective, informal, unusual, strange, foolish) |
| crackpot(noun, adjective, crazy, mad) |