| unintelligent(adjective, weak, simple, silly, foolish) |
| credulous(adjective, silly, stupid, green) |
| dense(adjective, dull, simple, silly, foolish) |
| simple-minded(adjective, silly, foolish, stupid, green) |
| insensate(adjective, dull, simple, silly, stupid) |
| nitwitted(adjective, simple, silly, foolish, stupid) |
| backward(adjective, silly, foolish, stupid, green) |
| dimwitted(adjective, silly, foolish, stupid, green) |
| feeble(adjective, silly, stupid, green) |
| gullible(adjective, silly, stupid, green) |
| illiterate(adjective, silly, stupid, green) |
| inexperienced(adjective, silly, stupid, green) |
| inexpert(adjective, silly, stupid, green) |
| slow(adjective, silly, foolish, stupid, green) |
| soft-headed(adjective, silly, stupid, green) |
| uneducated(adjective, silly, stupid, green) |