| bats in the belfry(expression, idiom, silly, foolish, mad) |
| beat(adjective, informal, unusual, wild, strange) |
| brainless(weak, simple, silly, foolish, unreasonable) |
| bugs |
| certifiable |
| characteristic(adjective, unusual, wild, strange, crazy) |
| cockamamie(adjective, weak, great, simple, wrong) |
| crack-brained(adjective, insane) |
| exotic |
| flipped(silly, foolish, mad, insane, unwise) |
| flipped out(expression, silly, foolish, crazy, mad) |
| frenzied(adjective, insane) |
| half-baked(weak, simple, silly, foolish, thoughtless) |
| half-witted(weak, simple, silly, foolish, thoughtless) |
| harebrained(adjective, weak, great, simple, extraordinary) |
| hysterical(adjective, insane) |
| idiotic(weak, simple, silly, foolish, crazy) |
| individual(adjective, unusual, strange, unique, eccentric) |
| jerky(weak, simple, silly, foolish, thoughtless) |
| ludicrous(adjective, weak, simple, unusual, wild) |