| crazy(noun, adjective, person, keen, warm) |
| madman(noun, person, character, madness, insanity) |
| maniac(noun, person, crazy, madness, insanity) |
| lunatic(noun, adjective, person, silly, foolish) |
| crackpot(noun, person, character, crazy, nut) |
| kook(noun, person, nut, fanatic, madness) |
| loony(noun, adjective, person, keen, warm) |
| psychotic(noun, adjective, person, madness, insanity) |
| nut(noun, crazy, fanatic, cuckoo, lunatic) |
| freak(noun, person, crazy, nut, fanatic) |
| zealot(noun, person, crazy, nut, fanatic) |
| daft(adjective, keen, warm, silly, foolish) |
| insane(adjective, simple, silly, foolish, crazy) |
| madcap(noun, person, madness, insanity, psycho) |
| nutty(adjective, simple, silly, foolish, crazy) |
| psychopath(noun, person, madness, insanity, psycho) |
| bonkers |
| fiend(noun, person, crazy, nut, fanatic) |
| psycho(noun, person, madness, insanity) |
| screwball(noun, crazy, nut, cuckoo, lunatic) |