cold-blooded

US /ˈkoʊldˌblʌdɪd/
UK /ˈkoʊldˌblʌdɪd/
"cold-blooded" picture
1.

having a body temperature that changes with the temperature of the surroundings

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Reptiles are cold-blooded animals.
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Fish are also cold-blooded creatures.
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warm-blooded
2.

without feeling or pity; cruel

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It was a cold-blooded murder.
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He made a cold-blooded decision to betray his friends.
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cruelheartlessruthlessunfeelingmercilessbrutalinhumancallouspitilesssavage
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in cold bloodcoldbloodmake someone's blood run coldcommon coldcold warcold-calling