| dull(adjective, dull, simple, slow, careless) |
| dumb(adjective, dull, simple, ability, slow) |
| obtuse(adjective, dull, simple, ability, slow) |
| stupid(adjective, dull, weak, simple, ability) |
| dense(adjective, dull, simple, ability, rough) |
| thick(adjective, dull, simple, ability, slow) |
| foolish(adjective, dull, weak, simple, foolish) |
| dim(adjective, dull, simple, slow, foolish) |
| stolid(adjective, dull, simple, slow, foolish) |
| cloddish(adjective, dull, stupid) |
| dim-witted(adjective, dull, simple, slow, foolish) |
| dopey(adjective, dull, slang, ability, slow) |
| moronic(adjective, dull, weak, simple, slow) |
| brainless(adjective, dull, weak, simple, slow) |
| simple(adjective, dull, weak, slow, silly) |
| unintelligent(adjective, dull, weak, simple, slow) |
| slow(adjective, dull, simple, heavy, silly) |
| slow-witted(adjective, dull, slow, stupid, impassive) |
| bovine(adjective, dull, careless, heavy, foolish) |
| dimwitted(adjective, slang, ability, stupid) |