Bloodless
来自Big Physics
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wiktionary
From Middle English blodles, from Old English blōdlēas(“bloodless”), equivalent to blood + -less. Cognate with Dutch bloedeloos(“bloodless”), German blutlos(“bloodless”), Danish blodløs(“bloodless”), Swedish blodlös(“bloodless”), Icelandic blóðlaus(“bloodless”).
etymonline
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.