The Collaborative International Dictionary
Half-witted \Half"-wit`ted\ (-t[e^]d), a. Weak in intellect; silly.
Wiktionary
a. Having a low intelligence; dim-witted
WordNet
adj. lacking mental capacity and devoid of subtlety [syn: dim-witted, simple, simple-minded]
mentally deficient [syn: feebleminded, slow-witted]
Usage examples of "half-witted".
From the milkhouse there was the steady thump, thump of a churn being manipulated by the half-witted girl, Eliza Stoughton.
Perhaps Squire Hall was the only one in Lewes Hundred who misdoubted that Hiram was half-witted.
I'm changed or no, I'll take my affidavy that you are the same old half-witted Hi that you used to be.
Near that window stood a church warden paying no attention to the service and loudly reproving a deaf, half-witted beggarwoman in a voice as flat and commonplace as the window and the street.
He gave Ziggy scripts with a solid framework and lots of interesting angles, but they'd never have got off the ground until Ziggy added his own curlicues and all those zany touches that seem to send half the half-witted public.
In the heavy shadows of a big tree before Doctor Welling's house, he stopped and stood watching half-witted Turk Smollet, who was pushing a wheelbarrow in the road.
We beat the pants off the sucker, but it took Buzz's half-witted performance to make people sit up and take notice.