| mad(adjective, silly, foolish, crazy, insane) |
| madman(noun, lunatic) |
| maniac(noun, person, crazy, eccentric, cuckoo) |
| screwy(adjective, silly, foolish, crazy, mad) |
| balmy(adjective, silly, foolish, unwise) |
| ding-a-ling(noun, slang, wise, crackpot) |
| fruitcake(noun, nut, fanatic, freak, loony) |
| loon(noun, slang, informal, sick, wise) |
| nuts(noun, adjective, slang, silly, mad) |
| odd(adjective, silly, foolish, usual, unwise) |
| peculiar(adjective, silly, foolish, usual, unwise) |
| psycho(noun, slang, silly, mad, sick) |
| strange(adjective, silly, foolish, usual, unwise) |
| daft(adjective, silly, foolish, crazy, mad) |
| dingbat(noun, person, slang, wise, crackpot) |
| dippy(adjective, silly, foolish, mad, insane) |
| dotty |
| erratic(adjective, silly, foolish, mad, usual) |
| foolish(adjective, silly, unwise) |
| freakish(adjective, usual) |