Source : Webster's Revised Unabridged Dictionary (1913)

Witless \Wit"less\, a.
   Destitute of wit or understanding; wanting thought; hence,
   indiscreet; not under the guidance of judgment. ``Witless
   bravery.'' --Shak.

         A witty mother! witless else her son.    --Shak.

         Witless pity breedeth fruitless love.    --Fairfax.
   -- {Wit"less*ly}, adv. -- {Wit"less*ness}, n.

Source : WordNet®

witless
     adj : (of especially persons) lacking sense or understanding or
           judgment [syn: {nitwitted}, {senseless}, {soft-witted}]