| simple-minded(adjective, simple, slow, silly, stupid) |
| simpleminded(adjective, dull, simple, silly, foolish) |
| slow(adjective, dull, simple, silly, foolish) |
| slow-witted(adjective, slow, stupid) |
| soft(adjective, silly, stupid, green, fat) |
| stolid(adjective, dull, simple, slow, foolish) |
| tomfool(adjective, foolish) |
| uneducated(adjective, silly, stupid, green, fat) |
| unthoughtful(adjective, thoughtless) |
| vacuous(adjective, dull, simple, slow, stupid) |
| besotted(adjective, simple, slow, stupid, boring) |
| bird-brained |
| birdbrained(silly, foolish, impulsive, impractical, unintelligent) |
| blank(adjective, thoughtless) |
| bubbleheaded(adjective, careless, silly, unsteady, inconstant) |
| credulous(adjective, silly, stupid, green, fat) |
| cretinous(adjective, foolish) |
| dazed(adjective, dull, simple, slow, stupid) |
| demented(foolish, unreasonable, illogical) |
| fatuitous |