Dictionary 1. (a.) Having no head; beheaded; as, a headless body, neck, or carcass.2. (a.) Destitute of a chief or leader. 3. (a.) Destitute of understanding or prudence; foolish; rash; obstinate. Thesaurus brainless crownless foolish ignorant inept insensate irrational lackbrained lean-minded lean-witted mindless not bright of little brain pea-brained pin-brained reasonless senseless slackminded slackwitted topless ungifted unintellectual unintelligent unreasoning untalented unthinking unwise witless |