| nuts(noun, adjective, slang, crazy, mad) |
| daft(adjective, insane, sane) |
| bonkers(adjective, slang, informal, crazy, mad) |
| crazy(adjective, informal, mad, sick, insane) |
| lunatic(adjective, crazy, mad, insane, irrational) |
| mad(adjective, crazy, insane, irrational, sane) |
| nutty(noun, adjective, slang, crazy, mad) |
| batty(noun, adjective, slang, crazy, insane) |
| demented(adjective, insane, sane) |
| insane(adjective, crazy, mad, irrational, sane) |
| loony(adjective, informal, insane, sane) |
| mental(adjective, insane, hacked, lunatic, psychiatric) |
| unbalanced(adjective, crazy, mad, insane, irrational) |
| deranged(adjective, crazy, mad, insane, irrational) |
| barmy(adjective, silly) |
| cracked(adjective, informal, insane, sane) |
| crackers(adjective, crazy, sick, sane, off) |
| dotty(adjective, crazy, sick, insane, irrational) |
| bananas(adjective, slang, crazy, mad, sane) |
| crazed(adjective, insane) |