| insane(adjective, silly, foolish, stupid, ill) |
| psychotic(adjective, silly, foolish, stupid, crazy) |
| crazy(adjective, silly, foolish, stupid, senseless) |
| mental(adjective, informal, silly, foolish, stupid) |
| psychopathological |
| mad(adjective, silly, foolish, stupid, irrational) |
| unbalanced(adjective, psychotic) |
| deranged(adjective, silly, foolish, stupid, irrational) |
| demented(adjective, silly, foolish, stupid, irrational) |
| disturbed(adjective, troubled) |
| mentally ill(expression, adjective, idiom, unwell, cuckoo) |
| psychopathologic |
| batty(adjective, silly, foolish, stupid) |
| crackbrained(adjective, crazy, hysterical, psychotic) |
| lunatic(adjective, silly, foolish, stupid, irrational) |
| nuts(adjective, silly, foolish, stupid, cuckoo) |
| moonstruck(adjective, silly, foolish, stupid, insane) |
| paranoiac |
| psycho(adjective, insane) |
| screwy(adjective, silly, foolish, stupid) |