| cuckoo(adjective, slang, silly, foolish, stupid) |
| disordered(adjective, insane, sane) |
| dotty(adjective, insane, sane) |
| idiotic(adjective, silly, foolish, stupid, mad) |
| mad as a hatter(expression, adjective, idiom, silly, mad) |
| mentally ill(expression, adjective, idiom, insane, sane) |
| not all there(expression, adjective, idiom, insane, sane) |
| odd(silly, foolish, unwise) |
| screwy(adjective, slang, silly, foolish, stupid) |
| around the bend(adjective, idiom, insane, sane) |
| awestruck |
| bananas(adjective, slang, sane) |
| barmy(silly, foolish, mad, insane, unwise) |
| bats in the belfry(expression, idiom, silly, foolish, mad) |
| bereft of reason(expression, idiom, insanity) |
| bughouse |
| crazy about |
| daffy(adjective, informal, sane) |
| delirious(adjective, silly, foolish, mad, insane) |
| fatuous(adjective, silly, foolish, stupid, insane) |