in cold blood is an adverb meaning "emotionlessly and heartlessly; with deliberate cruelty or callousness". It carries one recorded sense.
emotionlessly and heartlessly; with deliberate cruelty or callousness
“he cold-bloodedly planned the murder of his boss”
Definitions, synonyms and semantic relations for in cold blood come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.