| knee-jerk(noun, slang, sick, mad person) |
| loafer |
| loom(noun, slang, sick, mad person) |
| looneybin(noun, slang, sick, mad person) |
| loony tune(noun, slang, sick, mad person) |
| madder |
| mental(noun, slang, sick, mad person) |
| mental defective(noun, expression, neurotic, worrier, valetudinary) |
| mishoogeh(noun, slang, sick, mad person) |
| mishugah(noun, slang, sick, mad person) |
| non compos(noun, expression, neurotic, worrier, valetudinary) |
| not all there(noun, slang, sick, mad person) |
| nougat(noun, slang, sick, mad person) |
| nuts(noun, slang, sick, mad person) |
| oddity |
| raving lunatic(noun, expression, neurotic, worrier, valetudinary) |
| schiz(noun, slang, sick, mad person) |
| schizophrenic(noun, worrier, valetudinary) |
| screw-loose(noun, slang, sick, mad person) |
| trainwreck(noun, slang, sick, mad person) |