| psycho(noun, slang, sick, mad person) |
| basket case(noun, slang, sick, mad person) |
| crack-brain(noun, slang, sick, mad person) |
| crack-skull(noun, slang, sick, mad person) |
| cuckoo(noun, slang, sick, mad person) |
| flake(noun, slang, sick, mad person) |
| fruit-cake(noun, slang, sick, mad person) |
| goo-goo(noun, slang, sick, mad person) |
| goof(noun, slang, sick, mad person) |
| jerk(noun, slang, sick, mad person) |
| jerk-off(noun, slang, sick, mad person) |
| knee-jerk(noun, slang, sick, mad person) |
| kook(noun, slang, sick, mad person) |
| loom(noun, slang, sick, mad person) |
| loon(noun, slang, sick, mad person) |
| looneybin(noun, slang, sick, mad person) |
| loony(noun, slang, sick, mad person) |
| loony tune(noun, slang, sick, mad person) |
| luny(noun, slang, sick, mad person) |
| mental(noun, slang, sick, mad person) |