| bent(adjective, informal, unusual, wild, uneven) |
| bohemian |
| bonkers(adjective, silly, foolish, crazy, mad) |
| card(noun, character, figure, original, personality) |
| cuckoo(noun, adjective, slang, silly, foolish) |
| daft(adjective, keen, wild, strange, silly) |
| desultory(adjective, irregular, unpredictable, unreliable) |
| deviate(adjective, extraordinary, strange, exceptional, irregular) |
| dingbat(noun, character, slang, crazy, wise) |
| eccentric person(noun, expression, idiom) |
| extreme(unusual, special, rare) |
| farcical(adjective, funny, ridiculous, absurd, pitiful) |
| fickle |
| flakey |
| individual(noun, adjective, characteristic, extraordinary, unusual) |
| lunatic(noun, adjective, wild, silly, foolish) |
| mercurial(irregular, unpredictable, unreliable) |
| novel(adjective, unusual, strange, new, exceptional) |
| nutter |
| off the wall(expression, adjective, idiom, beat, unusual) |