| clueless(adjective, stupid) |
| cushion-witted(adjective, stupid) |
| daffy(weak, simple, silly, foolish, thoughtless) |
| dotty(adjective, weak, simple, silly, foolish) |
| fatuous(weak, simple, silly, foolish, thoughtless) |
| harebrained(weak, simple, silly, foolish, thoughtless) |
| ignorant(adjective, simple, slow, silly, foolish) |
| insane(weak, simple, silly, foolish, thoughtless) |
| mad(weak, simple, silly, foolish, thoughtless) |
| nutty(weak, simple, silly, foolish, thoughtless) |
| preposterous(weak, simple, silly, foolish, thoughtless) |
| blockheaded(adjective, foolish) |
| cockeyed |
| crackpot(adjective, foolish) |
| cretinous(adjective, foolish) |
| daft(weak, simple, silly, foolish, stupid) |
| defective(adjective, stupid) |
| dense(adjective, dull, simple, slow, silly) |
| dippy(weak, simple, silly, foolish, thoughtless) |
| empty-headed(simple, silly, foolish, stupid) |