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

adj free from blood or bloodshed

bloodless surgery”
“a bloodless coup”
nonviolent, unbloody
achieved without bloodshed
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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adj destitute of blood or apparently so

“"the bloodless carcass of my Hector sold"- John Dryden”
exsanguine, exsanguinous
no longer having or seeming to have or expecting to have life

adj anemic looking from illness or emotion

“tried to speak with bloodless lips”
ashen, blanched, livid, white
colorless, colourless
weak in color; not colorful

adj without vigor or zest or energy

“an insipid and bloodless young man”
lacking ardor or vigor or energy

adj 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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