In cold blood

prep_phrase

Definitions

Adverb
  1. 1
    emotionlessly and heartlessly; with deliberate cruelty or callousness wordnet
Prep_phrase
  1. 1
    In a ruthless and unfeeling manner, particularly as applied to first-degree murder committed without provocation and with malice aforethought. idiomatic

    "It was not a suicide! He was murdered in cold blood."

Etymology

From a specialized meaning of cold, referring to lack of empathy.

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