| simple-minded(adjective, simple, slow, silly, foolish) |
| slow(adjective, dull, simple, silly, foolish) |
| slow-witted |
| soft-witted |
| stolid(adjective, dull, simple, slow, foolish) |
| unperceiving |
| unsane(adjective, crazy, mad, odd, insane) |
| weak(simple, silly, foolish, thoughtless, unwise) |
| balmy(adjective, crazy, mad, odd, insane) |
| besotted(adjective, simple, slow, stupid, boring) |
| bird-brained |
| blind to(expression, adjective, innocent, unfamiliar, unconscious) |
| blockheaded(impulsive, impractical, half-baked, doomed, unplanned) |
| blunt(adjective, careless, thoughtless, inconsiderate) |
| cockamamy(adjective, silly, foolish, thoughtless, unwise) |
| confused(careless, stupid, unthinking, obtuse, unperceptive) |
| credulous(adjective, silly, stupid, green, fat) |
| dazed(dull, unintelligent) |
| deficient(adjective, dull, silly, foolish, stupid) |
| deranged(simple, silly, foolish, stupid, unsound) |