| feeble-minded(adjective, foolish, stupid, impulsive, impractical) |
| dotty(adjective, weak, simple, silly, foolish) |
| nuts(adjective, wild, silly, foolish, stupid) |
| risible |
| simple(adjective, dull, weak, slow, silly) |
| sappy(adjective, knowledge, slang, ability, foolish) |
| crackbrained |
| cuckoo(adjective, wrong, wild, silly, foolish) |
| daffy(adjective, simple, silly, foolish, stupid) |
| derisory(adjective, silly, foolish, fantastic, unwise) |
| dim-witted(adjective, foolish, stupid) |
| dopey(adjective, dull, simple, knowledge, slang) |
| half-baked(adjective, dull, simple, foolish, stupid) |
| half-witted(adjective, dull, weak, simple, slow) |
| hare-brained |
| outlandish(adjective, silly, foolish, absurd, unwise) |
| slow(adjective, dull, simple, mind, think) |
| balmy(adjective, simple, knowledge, slang, ability) |
| childish |
| cretinous(adjective, foolish, unintellectual) |