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cold-blooded
In a biological sense, this term describes ectothermic organisms. It is a technical descriptor devoid of emotional weight, used to categorize animals that cannot regulate their own internal body temperature.
When applied to human behavior, the term shifts into a highly negative, judgmental register. It describes a chilling detachment and a deliberate lack of compassion. In this context, it is almost exclusively used to describe heinous crimes or calculated cruelty, suggesting that the person acted with a level of premeditation and emotional void that is perceived as inhuman.
Meanings
Having a body temperature that varies with the temperature of the surrounding environment.
Examples
Snakes are cold blooded and must bask in the sun to warm up.
He committed the crime in a cold blooded manner without a second thought.
The dragon is a cold blooded beast that sleeps in the frozen caves.
I cannot believe she was so cold blooded as to fire him on Christmas Eve.
The witness described the attacker as a cold blooded professional.
How can you be so cold blooded when your own family is suffering?
Lizards are cold blooded and rely on external heat sources.