| erratic(adjective, strange, silly, crazy) |
| irrational(adjective, weak, simple, unusual, wild) |
| screwball(adjective, slang, silly, foolish, crazy) |
| unusual(adjective, strange, silly, foolish, crazy) |
| zany(adjective, weak, simple, silly, foolish) |
| demented(adjective, wrong, unusual, wild, strange) |
| dippy(adjective, weak, simple, silly, foolish) |
| flaky(adjective, silly, crazy, irregular) |
| psychotic(adjective, crazy, unstable, insane) |
| silly(adjective, weak, simple, foolish, crazy) |
| absurd(adjective, weak, simple, wrong, wild) |
| crazed(adjective, silly, foolish, crazy) |
| cuckoo(adjective, silly, foolish, crazy) |
| daffy(adjective, weak, simple, silly, foolish) |
| potty(adjective, wild, silly, foolish, crazy) |
| unbalanced(adjective, strange, silly, foolish, crazy) |
| berserk(adjective, silly, foolish, crazy) |
| maniacal(adjective, silly, foolish, crazy) |
| of unsound mind(expression, adjective, idiom, silly) |
| psycho(adjective, silly, foolish, crazy) |