cold-blooded

Definitions

Having a body temperature that varies with the temperature of the surrounding environment.

Lacking or showing no emotion, sympathy, or compassion; callous.

Examples

Reptiles are cold-blooded creatures that rely on the sun to regulate their body temperature.

The villain committed the cold-blooded murder without showing a single shred of remorse.

Synonyms

callous merciless ruthless heartless inhumane pitiless cruel

Antonyms

compassionate merciful kind warmhearted sympathetic tender humane