: showing no sympathy or mercy : done in a planned way without emotion. : based on facts : not affected by emotions. : having cold blood : having a body temperature that is similar to the temperature of the environment.

What does it mean when someone says they're cold-blooded?

cold-blooded Add to list Share. A cold-blooded animal has a body temperature that varies along with the outdoor temperature, and a cold-blooded person is someone who seems to feel no emotions. ... This meaning comes from the old-fashioned belief that blood temperature rises with emotion.

What is cold-blooded murder mean?

If someone kills in cold blood, they kill in a way that seems especially cruel because it seems to show no emotion. Violent or aggressive. aggression. aggressive.