Dim-witted

Tom is a dim-witted but good-hearted fellow.

Does Tom seem dim-witted to you?

Nemesio was scared of those noisy, dim-witted giants that called themselves humans.

It was a stroppy answer to a dim-witted question.

"Don't fool yourself," I said. "I could have slugged this pair of amateur gorillas any hour of the day or night. I've not done it because you've got nothing against them other than their being a pair of dim-witted nuisances."