1. without blood: bloodless surgery.
  2. very pale: a bloodless face.
  3. free from bloodshed; accomplished without bloodshed: a bloodless victory; a bloodless coup.
  4. spiritless; without vigor, zest, or energy: a dull, insipid, bloodless young man.
  5. without emotion or feeling; cold-hearted: bloodless data.


  1. without blood
  2. conducted without violence (esp in the phrase bloodless revolution)
  3. anaemic-looking; pale
  4. lacking vitality; lifeless
  5. lacking in emotion; cold; unfeeling

Old English blodleas; see blood (n.) + -less. The figurative sense in Middle English was “powerless.” Related: Bloodlessly.

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