| lunatic(noun, adjective, person, crazy, mad) |
| insane(adjective, violent, crazy, mad, fierce) |
| crazy(noun, adjective, person, mad, sick) |
| psychotic(noun, adjective, person, crazy, mad) |
| madman(noun, person, madness, insanity, lunatic) |
| crackpot(noun, person, crazy, mad, eccentric) |
| mad(noun, adjective, crazy, confused, insane) |
| nut(noun, person, concern, slang, informal) |
| loony(noun, adjective, person, wrong, informal) |
| psychopath(noun, person, crazy, mad, pervert) |
| zealot(noun, person, concern, crazy, nut) |
| fiend(noun, person, concern, interest, informal) |
| freak(noun, person, concern, slang, crazy) |
| kook(noun, person, crazy, mad, madness) |
| demented(adjective, violent, crazy, fierce, insane) |
| bedlamite(noun, person, crazy, madness, insanity) |
| deranged(adjective, crazy, mad, insane, irrational) |
| psycho(noun, adjective, person, crazy, mad) |
| fanatic(noun, person, concern, interest, crazy) |
| maniacal(adjective, insane, sane) |