| Headless 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 Entries 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 |