| insane(adjective, wild, silly, foolish, stupid) |
| batty(adjective, slang, wild, silly, foolish) |
| daft(adjective, wild, silly, foolish, stupid) |
| nuts(adjective, slang, silly, crazy) |
| lunatic(noun, adjective, person, wild, silly) |
| barmy(adjective, silly, foolish, crazy) |
| nutty(adjective, slang, silly, stupid, crazy) |
| bonkers(adjective, informal, silly, foolish, crazy) |
| screwy(adjective, slang, silly, stupid, crazy) |
| wacky(adjective, slang, silly, foolish, crazy) |
| crazed(adjective, wild, silly, foolish, stupid) |
| demented(adjective, wild, silly, foolish, stupid) |
| screwball(noun, adjective, slang, silly, crazy) |
| cracked(adjective, informal, wild, silly, foolish) |
| deranged(adjective, wild, silly, foolish, stupid) |
| dippy(adjective, silly, foolish, insane) |
| fruity(adjective, slang, silly, foolish) |
| nut(noun, slang, sick, wise) |
| potty(adjective, silly, foolish, insane) |
| psycho(noun, adjective, wild, silly, foolish) |