Definition of dull-witted
: mentally slow : dim-witted
He tried to teach her how to pronounce his last name with a French twirl, and when her tongue could not master it he accused her of being dull-witted.— James A. Michener Theirs was the perennial problem of quick-witted subjects under the governance of dull-witted administrators.— Declan Kiberd
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Merriam-Webster unabridged
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Time Traveler for dull-witted
The first known use of dull-witted was in the 14th century
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