When something is bloodless, it's free of violence. During a bloodless revolution, a regime is overthrown without anyone being killed.

A coup or a revolution is sometimes described as bloodless — in these instances, political and revolutionary goals are achieved without any blood being shed or lives being lost. A different meaning of bloodless is "drained of blood" or "pale and white," as your face might look if you saw a ghost. The Old English word was blodleas — figuratively, it meant "powerless."

Definitions of bloodless
  1. adjective
    free from blood or bloodshed
    bloodless surgery”
    “a bloodless coup”
    nonviolent, unbloody
    achieved without bloodshed
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    having or covered with or accompanied by blood
    containing blood
    bloodstained, gory
    covered with blood
    drawing blood from the body of another
    bloodthirsty, bloody-minded, sanguinary
    marked by eagerness to resort to violence and bloodshed
    crimson, red, violent
    characterized by violence or bloodshed
    homicidal, murderous
    characteristic of or capable of or having a tendency toward killing another human being
    butcherly, gory, sanguinary, sanguineous, slaughterous
    accompanied by bloodshed
    characterized by bloodshed and carnage for both sides
    merciless, unmerciful
    having or showing no mercy
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  2. adjective
    destitute of blood or apparently so
    “"the bloodless carcass of my Hector sold"- John Dryden”
    synonyms: exsanguine, exsanguinous
    no longer having or seeming to have or expecting to have life
  3. adjective
    anemic looking from illness or emotion
    “tried to speak with bloodless lips”
    synonyms: ashen, blanched, livid, white
    colorless, colourless
    weak in color; not colorful
  4. adjective
    without vigor or zest or energy
    “an insipid and bloodless young man”
    lacking ardor or vigor or energy
  5. adjective
    devoid of human emotion or feeling
    “charts of bloodless economic indicators”
    not human; not belonging to or produced by or appropriate to human beings
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