| idiotic(adjective, dull, simple, silly, foolish) |
| moronic(adjective, dull, simple, slow, silly) |
| stupid(noun, adjective, dull, simple, slow) |
| silly(noun, adjective, dull, simple, fool) |
| foolish(adjective, dull, simple, silly, stupid) |
| inane(adjective, dull, simple, silly, foolish) |
| simple(noun, adjective, dull, ability, slow) |
| asinine(adjective, dull, simple, silly, foolish) |
| backward(adjective, dull, simple, slow, silly) |
| senseless(adjective, dull, silly, foolish, stupid) |
| slow(adjective, dull, simple, silly, foolish) |
| brainless(adjective, dull, simple, silly, foolish) |
| dull(adjective, simple, slow, silly, foolish) |
| witless(adjective, dull, simple, silly, foolish) |
| dumb(adjective, dull, simple, silly, foolish) |
| simple-minded(adjective, dull, simple, slow, silly) |
| feeble(adjective, weak, silly, stupid, green) |
| half-witted(adjective, dull, simple, slow, silly) |
| thick(adjective, dull, simple, silly, foolish) |
| unintelligent(adjective, dull, simple, silly, foolish) |