| moronic(adjective, dull, simple, slow, foolish) |
| dumb(adjective, dull, simple, slow, foolish) |
| simple(adjective, dull, ability, slow, offensive) |
| stupid(adjective, dull, simple, slow, foolish) |
| dull(adjective, simple, ability, slow, offensive) |
| slow-witted(adjective, ability, offensive, stupid) |
| dim-witted(adjective, dull, simple, slow, foolish) |
| imbecilic(adjective, simple, slow, foolish, stupid) |
| fatuous(adjective, silly, foolish, stupid, vague) |
| foolish(adjective, silly, stupid, vague, impulsive) |
| retarded(adjective, dull, ability, offensive, stupid) |
| simple-minded(adjective, dull, simple, ability, slow) |
| idiotic(adjective, foolish, stupid, impulsive, impractical) |
| thick(adjective, simple, slow, foolish, stupid) |
| weak-minded(adjective, ability, offensive) |
| slow(adjective, dull, simple, ability, offensive) |
| backward(adjective, dull, simple, ability, slow) |
| empty-headed |
| witless(adjective, simple, slow, foolish, stupid) |
| asinine(adjective, foolish, stupid) |