Adjective : quick-witted; slow-witted; dull-witted.    From Dictionary.com. 

Once there came along a man who all said was half-witted.    From Wordnik.com.  [Wealth of the World's Waste Places and Oceania] Reference

By nature the Arab is active, vivacious, and keen-witted.    From Wordnik.com.  [Wealth of the World's Waste Places and Oceania] Reference

She was a quick-witted creature, and knew just what to do.    From Wordnik.com.  [Madeline Payne, the Detective's Daughter] Reference

Joe was so tongue-tied that his sisters thought him slow-witted.    From Wordnik.com.  [The Dimaggio Nobody Knew] Reference

"On the contrary, you are unusually clear-witted," was the answer.    From Wordnik.com.  [Under the Rose] Reference

Olivia Munn can deliver the quick-witted evidence all for herself.    From Wordnik.com.  [COMIC-CON 2010: Rising OLIVIA MUNN has already inherited the geeks. Will she now inherit the Earth?] Reference

Once upon a time there was a king and queen who had a half-witted son.    From Wordnik.com.  [Italian Popular Tales] Reference

Shut your mouth, child, -- you look half-witted with it open that way.    From Wordnik.com.  [The Heart of Arethusa] Reference

"An old neighbor of mine who is half-witted," replied the queen, quickly.    From Wordnik.com.  [Italian Popular Tales] Reference

She is only half-witted, you know, and didn't do her teachers much credit.    From Wordnik.com.  [Letters from Port Royal Written at the Time of the Civil War (1862-1868)] Reference

And yet, quick-witted as she was, it did not occur to her to find a new one.    From Wordnik.com.  [An Australian Lassie] Reference

But there have been moments when he's appeared quite sane, even sharp-witted.    From Wordnik.com.  [Going Ballistic (Sort of)] Reference

The detective did not attempt to slink away -- he was too cool and ready-witted.    From Wordnik.com.  [The Dock Rats of New York] Reference

But can the reunited popsters update their dim-witted dance music for 21st-century ears?.    From Wordnik.com.  [PERISCOPE] Reference

She was quick-witted, she might quite conceivably guess at the existence of some riddle.    From Wordnik.com.  [Antony Gray,—Gardener] Reference

"He's got that Southern style of being quick-witted with a slow delivery," Boritt recalls.    From Wordnik.com.  [But Words Will Never Hurt Me] Reference

Cage plays Kaufman as well as his genial, slow-witted (and fictitious) twin brother, Donald.    From Wordnik.com.  [Confessions Of An Outrageous Mind] Reference

Garcia was evidently, as the listening detective discerned, a very shrewd, quick-witted man.    From Wordnik.com.  [The Dock Rats of New York] Reference

Clarence proved himself alert and quick witted in retort, with an answer ready for every objection.    From Wordnik.com.  [Love at Paddington] Reference

She would have been amazed at me writing this book because she thought I was completely half-witted.    From Wordnik.com.  [The Duchess of Devonshire: 'When you are very old, you cry over some things, but not a lot'] Reference

This helps explain, I think, why so much of it turns out to be superficial, misleading or dim-witted.    From Wordnik.com.  [Book Excerpt: 'Untruth: Why The Conventional Wisdom Is (Almost Always) Wrong'] Reference

Eline's bossy, no-nonsense sister Betsy gradually recognizes that her beloved only child is slow-witted.    From Wordnik.com.  [Tolstoy and Trollope Fans, Meet Couperus] Reference

As the slow-witted driver gets out of the car he can be heard exclaiming that he "didn't see" the rocks.    From Wordnik.com.  [World's Worst Driver? Ridiculous Car Crash Caught On Tape (VIDEO)] Reference

To describe Prothero as "quick-witted" or his interests as "interdisciplinary" wouldn't quite do him justice.    From Wordnik.com.  [The Gospel of Prothero] Reference

Some industry wags called Levin "Forrest Gump," after the slow-witted movie character, say Hollywood executives.    From Wordnik.com.  [One More Stab At It] Reference

Getting out, once you're locked in, requires cleverness because dim-visioned bosses aren't necessarily dim-witted.    From Wordnik.com.  [Adele Scheele: How to Escape a Dead-End Job] Reference

Mademoiselle Marie was so quick-witted that her mother often suspected she knew the secret which concerned herself.    From Wordnik.com.  [The French Immortals Series — Complete] Reference

He could invent schemes that often made some of the duller-witted chaps fairly gasp, and declare he must be a wizard.    From Wordnik.com.  [Fred Fenton on the Track or, The Athletes of Riverport School] Reference

The players usually select some ready witted person to assume the part of Justice, another acts as Crier or Collector.    From Wordnik.com.  [Games For All Occasions] Reference

She was quick-witted and adaptable; she would be a tremendous social success with a little expert coaching, and he ----?.    From Wordnik.com.  [The Fifth Ace] Reference

This keen-witted, uncontrollable girl, was putting up barrier upon barrier between herself and their desire to serve her.    From Wordnik.com.  [Madeline Payne, the Detective's Daughter] Reference

What the Lebanese protestors are saying is what many Arabs are feeling: they're fed up with all these dim-witted dictators.    From Wordnik.com.  [Shadowland: Democratic Terrorists?] Reference

Knowing how quick-witted she is, it would likely have been the first reaction she had, rather than one she had to think about for days.    From Wordnik.com.  [Terry Krepel: Ann Coulter Doesn't Hate Gays Enough for WorldNetDaily] Reference

And at this handle, the careless, the brutal, the malicious, and the dense witted -- all Those Others -- lunge, pull, and twist by turns.    From Wordnik.com.  [The Idler Magazine, Vol III. May 1893 An Illustrated Monthly] Reference