| loony(noun, adjective, slang, sick, mad person) |
| psycho(noun, slang, sick, mad person) |
| kook(noun, slang, sick, mad person) |
| mental(noun, adjective, slang, sick, mad person) |
| not all there(noun, adjective, slang, sick, mad person) |
| nut(noun, slang, sick, mad person) |
| nuts(noun, adjective, slang, sick, mad person) |
| nutter(noun, slang, sick, mad person) |
| schizo(noun, slang, sick, mad person) |
| screwball(noun, slang, sick, mad person) |
| basket case(noun, slang, sick, mad person) |
| coo-coo(noun, slang, sick, mad person) |
| crack-brain(noun, slang, sick, mad person) |
| crack-skull(noun, slang, sick, mad person) |
| crazy(noun, adjective) |
| 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) |