Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Formed without a head.
  • adj. Decapitated.
  • adj. Lacking a leader or director.
  • adj. Lacking intelligence and prudence; stupid or foolish.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Without a head; decapitated.
  • adj. Without a head in the sense of leadership.
  • adj. Not having a head morpheme or word.
  • adj. Running without a user interface; specifically, running without a monitor, keyboard, and mouse.
  • adj. Without a head of foam.
  • adj. Destitute of understanding or prudence; foolish; rash.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having no head; beheaded.
  • adj. Destitute of a chief or leader.
  • adj. Destitute of understanding or prudence; foolish; rash; obstinate; mindless.

from The Century Dictionary and Cyclopedia

  • Having no head; acephalous; acranial: as, the headless mollusks; headless vertebrates.
  • Destitute of a chief or leader.
  • Destitute of understanding or prudence; foolish.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not having a head or formed without a head
  • adj. not using intelligence

Etymologies

From Anglo-Saxon, equivalent to head +‎ -less. (Wiktionary)

Examples

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