| dimwitted(adjective, dull, simple, silly, foolish) |
| dippy(weak, simple, silly, foolish, thoughtless) |
| gormless |
| ill-considered(adjective, weak, simple, silly, foolish) |
| illogical(adjective, simple, silly, stupid, insignificant) |
| inattentive(adjective, silly, foolish, senseless, unnecessary) |
| incongruous(adjective, silly, stupid, insignificant, unreasonable) |
| indecisive |
| inept(adjective, simple, slow, careless, foolish) |
| inexperienced(adjective, silly, stupid, green, fat) |
| inexpert(adjective, silly, stupid, green, fat) |
| injudicious(adjective, weak, simple, mind, think) |
| insane(weak, simple, silly, foolish, crazy) |
| jejune |
| jerky(adjective, weak, simple, silly, foolish) |
| lumpish |
| naive(adjective, dull, simple, slow, careless) |
| not bright(expression, adjective, simple, slow, stupid) |
| nutty(adjective, weak, simple, silly, foolish) |
| pathetic |