half-witted

I have two anecdotes of two peers, who might be said to come under the description of half-witted.

He had a dull eye, a long, sheeplike nose and a wagging under lip; and Natalie vowed he was half-witted.

Walton discouraged calls from other cattle men, and lived alone except for a half-witted Mexican—Loco.

And the crowds would go from tank to tank, looking in at us through the glass—with their mouths open, like half-witted flounders.