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Adjective: headless  hed-lus
  1. Not using intelligence
    "The headless animal can endure pain, without manifesting even a flinch";
    - brainless
  2. Not having a head or formed without a head
    "the headless horseman"; "brads are headless nails"

See also: acephalous, beheaded, decapitated, stupid, unintelligent

Antonym: headed

Encyclopedia: Headless