cold-blooded
🇺🇸
/ˌkəʊld ˈblʌdɪd/
🇬🇧
/ˌkəʊld ˈblʌdɪd/
lacking empathy or compassion
The detective was shocked by the cold-blooded nature of the crime.
having a variable body temperature that changes with the environment
The snake is cold-blooded, so it needs to sunbathe to warm up.