| inane(adjective, dull, simple, slight, silly) |
| ignorant(adjective, simple, slight, slow, silly) |
| slow-witted(adjective, mind, think, stupid) |
| unwise(adjective, weak, simple, silly, foolish) |
| dim(adjective, dull, simple, slow, foolish) |
| shallow(adjective, simple, slight, slow, silly) |
| stolid(adjective, dull, simple, slow, foolish) |
| unintellectual(adjective, simple, slow, stupid, boring) |
| unreasoning(adjective, imbecility folly) |
| unthinking(adjective, dull, simple, slight, silly) |
| insensate(adjective, dull, simple, ability, slow) |
| asinine(adjective, weak, simple, silly, foolish) |
| daft(adjective, weak, simple, slow, silly) |
| dim-witted(adjective, dull, simple, slow, foolish) |
| irrational(adjective, weak, simple, silly, foolish) |
| opaque(adjective, dull, silly, foolish, stupid) |
| thoughtless(adjective, careless, indifferent, silly, foolish) |
| ungifted |
| weak-minded(adjective, ability, mind, think, planned) |
| brute |