Meaning of “cold-blooded” in the English Dictionary

"cold-blooded" in British English

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uk /ˌkəʊldˈblʌd.ɪd/ us /ˌkoʊldˈblʌd.ɪd/

Cold-blooded animals can only control their body heat by taking in heat from the outside or by being very active:

Snakes and lizards are cold-blooded animals.

behaving in a very cruel way with no sympathy for other people:

a cold-blooded murder

(Definition of “cold-blooded” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"cold-blooded" in American English

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us /ˈkoʊld ˈblʌd·ɪd/

cold-blooded adjective (VARYING TEMPERATURE)

having a body temperature that varies with the environment

cold-blooded adjective (LACKING SYMPATHY)

lacking the sympathy and kindness that all people should show

(Definition of “cold-blooded” from the Cambridge Academic Content Dictionary © Cambridge University Press)