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cold-blooded (adj.)

also coldblooded; 1590s, of persons, "without emotion, wanting usual sympathies, unfeeling;" of actions, from 1828. The phrase refers to the notion in old medicine that blood temperature rose with excitement. In the literal sense, of reptiles, etc., "having blood very little different in temperature from the surrounding environment," from c. 1600. From cold (adj.) + blood (n.). Related: Cold-bloodedly; cold-bloodedness.

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Definitions of cold-blooded from WordNet
1
cold-blooded (adj.)
without compunction or human feeling;
cold-blooded killing
Synonyms: cold / inhuman / insensate
2
COLD-BLOODED (adj.)
having cold blood (in animals whose body temperature is not internally regulated);
From wordnet.princeton.edu