| dazed(dull, unintelligent, witless) |
| dull-witted(adjective, stupid) |
| fat(adjective, silly, stupid, green, thick) |
| futile(dull, unintelligent, witless) |
| illiterate(adjective, silly, stupid, green, fat) |
| inexperienced(adjective, silly, stupid, green, fat) |
| inexpert(adjective, silly, stupid, green, fat) |
| irrelevant(dull, unintelligent, witless) |
| laughable(dull, unintelligent, witless) |
| loopy(adjective, foolish) |
| loser(dull, unintelligent, witless) |
| mentally deficient(expression, silly, foolish, stupid) |
| mug |
| naive(dull, unintelligent, witless) |
| nitwitted(adjective, silly, stupid, green, fat) |
| not intelligent(expression, silly, foolish, stupid) |
| out to lunch(expression, idiom, dull, unintelligent, witless) |
| puerile(dull, unintelligent, witless) |
| rash(dull, silly, thoughtless, unwise, unintelligent) |
| reckless(silly, thoughtless, unwise) |