| sluggish(adjective, action, dull, simple, slow) |
| thick-witted(adjective, dull, ability) |
| torpid(adjective, action, dull, slow, cold) |
| unwise(adjective, weak, simple, wrong, wild) |
| wacky(adjective, weak, simple, wrong, wild) |
| fool(noun, adjective, sap) |
| addle-pated |
| batty(adjective, wild, silly, foolish, insignificant) |
| cloddish(adjective, dull) |
| cockeyed(silly, foolish, unwise) |
| crass(adjective, offensive, rude, silly, coarse) |
| cretinous(adjective, foolish, unintellectual) |
| cuckoo(adjective, silly, foolish, unwise) |
| daffy(adjective, weak, simple, slow, silly) |
| dotty(adjective, weak, simple, silly, foolish) |
| dummy(adjective, dull, simple, informal, intelligent) |
| flat(adjective, dull, slow, silly, ordinary) |
| frivolous(careless, silly, crazy, vague, absurd) |
| futile(adjective, dull, silly, insignificant, idle) |
| half-baked(adjective, dull, weak, simple, careless) |