headless

from WordNet (r) 3.0 (2006)
headless
    adj 1: not having a head or formed without a head ; "the
           headless horseman"; "brads are headless nails" [ant:
           {headed}]
    2: not using intelligence [syn: {brainless}, {headless}]
    
from The Collaborative International Dictionary of English v.0.48
Headless \Head"less\, a. [AS. he['a]fodle['a]s.]
   1. Having no head; beheaded; as, a headless body, neck, or
      carcass.
      [1913 Webster]

   2. Destitute of a chief or leader. --Sir W. Raleigh.
      [1913 Webster]

   3. Destitute of understanding or prudence; foolish; rash;
      obstinate; mindless. [Obs.]
      [1913 Webster]

            Witless headiness in judging or headless hardiness
            in condemning.                        --Spenser.
      [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
28 Moby Thesaurus words for "headless":
      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

    

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