the.com/cold blood

Not a temperature but a verdict: the calm that makes cruelty so chilling.

means Acting with deliberate, unfeeling calm — especially in violence — rather than in the heat of anger or passion.

from Born from old medical theory: physicians once believed the blood ran hot when stirred by rage or passion, so to act 'in cold blood' meant to act when the blood had cooled — coolly, deliberately, without the excuse of a fevered moment. The phrase, in English since at least the 17th century, mirrors the older 'in hot blood,' and both lean on the long-held humoral idea that temperament literally lived in the temperature of one's blood. Reptiles only later lent the word 'cold-blooded' its second, chillier life.

biology myth
No animal's blood actually runs cold; ectotherms match surroundings
legal weight
Premeditation, not rage, earns harsher murder charges
reptile truth
Lizards bask precisely to keep blood warm enough
truman capote
His nonfiction novel made the phrase literary
poker face
Coldblooded means unbothered, calculating, terrifyingly composed
for instance

in cold blood — truman capote's 1966 true crime novel about the 1959 clutter family murders in kansas

cold blooded animals — reptiles and amphibians like snakes, lizards, and frogs that regulate body temperature through environment

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