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.