| crazy(noun, adjective, person, foolish) |
| lunatic(noun, adjective, person, crazy) |
| loony(noun, adjective, person, informal, foolish) |
| maniac(noun, person, crazy, eccentric) |
| kook(noun, person, character, slang, crazy) |
| madman(noun, adjective, person, crazy) |
| nut(noun, character, slang, crazy) |
| psychotic(noun, adjective, person, madness) |
| crank(noun, informal, crazy, original) |
| wild(adjective, crazy, odd, insane) |
| psycho(noun, person, nut, fanatic) |
| psychopath(noun, person, crazy, nut) |
| absurd(adjective, foolish, crazy, odd) |
| nonsensical(adjective, foolish, crazy, odd) |
| cuckoo(noun, adjective, slang, wise) |
| fruitcake(noun, character, crazy, eccentric) |
| balmy(adjective, crazy, odd, insane) |
| barmy(adjective, crazy, odd, insane) |
| daft(adjective, crazy, odd, insane) |
| loon(noun, informal, fool, crazy) |