| deranged(adjective, wild, silly, foolish, stupid) |
| foolish(adjective, silly, stupid, unwise) |
| gaga(noun, adjective, informal, insane, sane) |
| loco(adjective, slang, insane, sane) |
| bananas(adjective, slang, sane) |
| dippy(adjective, silly, foolish, mad, insane) |
| fatuous(adjective, wrong, wild, silly, foolish) |
| fruity(adjective, slang, silly, foolish, mad) |
| goose(noun, bird) |
| nut(noun, slang, mad, sick, wise) |
| potty(adjective, silly, foolish, mad, insane) |
| psycho(noun, adjective, wild, silly, foolish) |
| touched(adjective, silly, stupid, crazy, mad) |
| unbalanced(adjective, silly, foolish, crazy, mad) |
| chirp(noun, verb, ululation, ululate) |
| crackers(adjective, sane) |
| crackpot(noun, adjective, mad, wise, schizophrenic) |
| goof(noun, slang, sick, mad person) |
| goofy(adjective, silly, foolish, unwise) |
| idiotic(adjective, wild, silly, foolish, stupid) |