Definition of cold-blooded
1a
: done or acting without consideration, compunction, or clemency
cold-blooded murder
b
: matter-of-fact, emotionless
a cold-blooded assessment
2
: having cold blood
specifically
: having a body temperature not internally regulated but approximating that of the environment
4
: noticeably sensitive to cold
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Merriam-Webster unabridged
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Time Traveler for cold-blooded
The first known use of cold-blooded was in 1606
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