Etymology
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bloodless (adj.)

Old English blodleas, "drained of blood;" see blood (n.) + -less. The figurative sense in Middle English was "powerless, without spirit or energy." Meaning "free from bloodshed" is from c. 1600; that of "cold-hearted" is from 1881. Related: Bloodlessly.

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Definitions of bloodless

bloodless (adj.)
destitute of blood or apparently so; "the bloodless carcass of my Hector sold"- John Dryden;
Synonyms: exsanguine / exsanguinous
bloodless (adj.)
free from blood or bloodshed;
bloodless surgery
a bloodless coup
bloodless (adj.)
without vigor or zest or energy;
an insipid and bloodless young man
bloodless (adj.)
devoid of human emotion or feeling;
charts of bloodless economic indicators
bloodless (adj.)
anemic looking from illness or emotion; "lips...livid with the hue of death"- Mary W. Shelley;
tried to speak with bloodless lips
Synonyms: ashen / blanched / livid / white
From wordnet.princeton.edu