half-witted

Or, what more likely than that these ignorant and half-witted people should seek to manage an afflicted kinswoman by violence?

He told one of the prisoners, a half-witted lad, that he should be free if he would only do exactly as he was bidden.

I involuntarily exclaimed, when I had finished reading it, 'What a contrast between this poor half-witted man and myself!

At last her desire is realized: a son is born to her; but the child, conceived in madness, is born half-witted.

It irritated her to be teased about Pink as much as it used to annoy her to be teased about the half-witted Peter Finn.