| foolish(adjective, dull, simple, knowledge, ability) |
| dull(adjective, quiet, simple, flat, low) |
| goofy(adjective, silly, foolish, stupid, frivolous) |
| stupid(adjective, action, dull, simple, ability) |
| doltish(adjective, dull, ability, slow, foolish) |
| dumb(adjective, dull, simple, ability, slow) |
| obtuse(adjective, dull, ability, slow, stupid) |
| thick(adjective, dull, simple, ability, slow) |
| lethargic(adjective, action, dull, quiet, weak) |
| silly(adjective, knowledge, ability, stupid) |
| sluggish(adjective, action, dull, quiet, weak) |
| torpid(adjective, action, dull, quiet, weak) |
| dim(adjective, dull, simple, stupid, limited) |
| dopy(noun, adjective) |
| feeble(adjective, dull, strong, weak, easy) |
| thickheaded(adjective, ability, slow, stupid) |
| brainless(adjective, dull, slow, foolish, stupid) |
| hebetudinous(adjective, action, dull, ability, slow) |
| moronic(adjective, dull, simple, knowledge, ability) |
| slow(adjective, dull, quiet, weak, simple) |