| nutty(adjective, weak, simple, pleasant, slang) |
| daft(adjective, weak, simple, slow, silly) |
| foolish(adjective, weak, simple, silly, stupid) |
| crazy(adjective, weak, simple, silly, foolish) |
| loony(adjective, weak, simple, pleasant, happy) |
| nuts(adjective, slang, silly, foolish, crazy) |
| fatuous(adjective, weak, simple, silly, foolish) |
| goofy(adjective, silly, frivolous, dizzy, frothy) |
| insane(adjective, weak, simple, silly, foolish) |
| mad(adjective, weak, simple, silly, foolish) |
| wacky(adjective, weak, simple, slang, silly) |
| batty(adjective, slang, silly, foolish, stupid) |
| bonkers(adjective, slang, informal, crazy, mad) |
| demented(adjective, simple, silly, foolish, crazy) |
| dotty(adjective, weak, simple, silly, foolish) |
| dippy(adjective, slang, crazy, mad) |
| loco(adjective, slang, crazy, mad, sane) |
| bananas(adjective, slang, crazy, mad, sane) |
| cuckoo(adjective, slang, crazy, sane) |
| deranged(adjective, simple, silly, foolish, crazy) |