| imbecile(adjective, dull, simple, slow, silly) |
| modest(adjective, quiet, restraint, humble, shy) |
| moronic(adjective, dull, simple, slow, silly) |
| rearwards |
| slow-witted(adjective, ability) |
| afraid(adjective, weak, soft, slow, base) |
| conservative(adjective, dull, moderate, low, stupid) |
| dim(adjective, dull, simple, slow, boring) |
| dim-witted(adjective, dull, simple, slow, foolish) |
| dumb(adjective, dull, simple, slow, silly) |
| feeble-minded(adjective, dull, simple, ability, slow) |
| feebleminded |
| obtuse(adjective, dull, simple, slow, silly) |
| sluggish(adjective, adverb, dull, simple, low) |
| unenlightened(adjective, knowledge, slow) |
| unprogressive(adjective, dull, moderate, low, stupid) |
| withdrawn(adjective, person, quiet, gentle, feelings) |
| aloof(adjective, person, quiet, gentle, feelings) |
| belated(adjective, adverb, dull, low, slow) |
| benighted(adjective, knowledge, ignorant, unenlightened) |