| ape(noun, adjective, silly, insane) |
| bats in the belfry(expression, adjective, idiom, silly) |
| deranged(adjective, silly, insane, frantic) |
| mad as a March hare(expression, adjective, idiom, silly) |
| mad as a hatter(expression, adjective, idiom, silly) |
| nutty as fruitcake(expression, adjective, idiom, silly) |
| of unsound mind(expression, adjective, idiom, silly) |
| out to lunch(expression, adjective, idiom, silly) |
| potty(adjective, silly, confused, insane) |
| round the bend(expression, adjective, idiom, silly) |
| schizo(adjective, silly, confused, insane) |
| screw loose(expression, adjective, silly, confused) |
| unglued(adjective, silly, confused, insane) |
| barmy(adjective, silly, insane) |
| batty(adjective, silly, insane) |
| berserk(adjective, silly, insane) |
| bonkers(adjective, silly, insane) |
| cracked(adjective, silly, insane) |
| crazed(adjective, silly, insane, hacked) |
| cuckoo(adjective, silly, insane) |