in_cold_blood
1. [ adverb ] (criminal law) in a cold-blooded manner
Synonyms: cold-bloodedly
Examples:

"he cold-bloodedly planned the murder of his boss"

2. [ adverb ] in a cold unemotional manner
Synonyms: coldly without_emotion
Examples:

"he killed her in cold blood"

Related terms: cold cold
Similar spelling:   in_childbed
  insolvable
  inculpable