| vapid(adjective, dull, flat, property, silly) |
| mindless(adjective, dull, simple, wrong, slow) |
| feeble-minded(adjective, dull, simple, slow, foolish) |
| nutty(adjective, weak, simple, wrong, wild) |
| imbecile(noun, adjective, dull, simple, slow) |
| risible(adjective, silly, funny, ridiculous, absurd) |
| thickheaded(adjective, simple, ability, slow) |
| uninteresting(adjective, dull, flat, property, silly) |
| weak-minded(adjective, dull, simple, mind, slow) |
| unreasonable(adjective, weak, simple, wrong, careless) |
| bovine(adjective, dull, careless, heavy, foolish) |
| dazed(adjective, dull, intelligent, numb, unintelligent) |
| dolt(noun, person, yoyo, oxen) |
| dopey(adjective, action, dull, simple, slang) |
| dull-witted |
| tedious(adjective, dull, simple, flat, slow) |
| thoughtless(adjective, dull, sharp, rough, harsh) |
| unthinking(adjective, dull, careless, indifferent, foolish) |
| backward(adjective, dull, simple, slow, silly) |
| boneheaded(adjective, simple, slow, silly, unintelligent) |