| dull(adjective, simple, ability, slow, silly) |
| moronic(adjective, dull, simple, slow, silly) |
| simple(adjective, dull, ability, honest, slow) |
| half-witted(adjective, dull, simple, ability, slow) |
| stupid(adjective, dull, simple, slow, informal) |
| dumb(adjective, dull, simple, slow, silly) |
| imbecile(adjective, dull, simple, slow, silly) |
| dense(adjective, dull, simple, slow, silly) |
| foolish(adjective, silly, stupid, green) |
| silly(adjective, foolish, stupid, green) |
| slow(adjective, dull, simple, ability, silly) |
| backward(adjective, dull, simple, ability, slow) |
| brainless(adjective, simple, slow, silly, stupid) |
| idiotic(adjective, silly, foolish, stupid, green) |
| obtuse(adjective, simple, slow, silly, stupid) |
| soft(adjective, ability, informal, silly, stupid) |
| thick(adjective, simple, slow, silly, foolish) |
| unintelligent(adjective, dull, simple, slow, silly) |
| witless(adjective, simple, slow, silly, foolish) |
| asinine(adjective, silly, foolish, stupid, green) |