cold blooded

/koʊld ˈblʌdɪd/
adjective
  1. Having a body temperature that changes with the surrounding environment (used for animals like reptiles, fish, and amphibians).
    • Cold-blooded creatures become sluggish in cool weather.
    • Unlike mammals, most fish are cold-blooded.
    • Snakes are cold-blooded animals that bask in the sun to warm up.
  2. Showing no emotion or pity; cruel and deliberate.
    • It was a cold-blooded decision to fire the workers just before the holidays.
    • He gave a cold-blooded stare and walked away without a word.
    • The cold-blooded murder shocked the entire community.
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