| psychopath |
| round the bend(expression, adjective, idiom, wild, silly) |
| screw loose(expression, adjective, wild, silly, foolish) |
| screwy(adjective, silly, foolish, mad, insane) |
| unbalanced(adjective, silly, foolish, mad, insane) |
| unglued(adjective, wild, silly, foolish, mad) |
| unhinged(adjective, silly, foolish, mad, insane) |
| amiss(adjective, disordered, defective) |
| amok(adjective, disordered, defective) |
| ape(adjective, silly, foolish, mad, insane) |
| aper(adjective, silly, mad, confused, insane) |
| basket case(noun, slang, sick, mad person) |
| berserk(adjective, silly, foolish, mad, insane) |
| bizarrely unusual(expression, adjective, strange, crazy, absurd) |
| broken crazy(expression, adjective, disordered, defective) |
| bughouse |
| certifiable |
| confused(adjective, frantic, disordered, defective, aper) |
| coo-coo(noun, slang, sick, mad person) |
| crack-brain(noun, slang, sick, mad person) |