| lunatic(noun, adjective, person, crazy) |
| insane(adjective, violent, crazy, fierce) |
| crazy(noun, adjective, person, sick) |
| psychotic(noun, adjective, person, crazy) |
| crackpot(noun, person, crazy, eccentric) |
| nut(noun, person, concern, slang, informal) |
| psychopath(noun, person, crazy, pervert) |
| kook(noun, person, crazy, madness) |
| deranged(adjective, crazy, insane, irrational) |
| psycho(noun, adjective, person, crazy) |
| loco(adjective, slang, crazy, sick) |
| unsound(adjective, crazy, sick, insane) |
| frantic(adjective, violent, crazy, vicious) |
| frenetic(adjective, violent, vicious, fierce) |
| frenzied(adjective, violent, crazy, fierce) |
| fruity(adjective, slang, insane, sane) |
| furious(adjective, vicious, unreasonable, angry) |
| loon(noun, person, crazy, patient) |
| mentally ill(expression, adjective, idiom, crazy) |
| crank(noun, crazy, radical, lunatic) |