Adverb
emotionlessly and heartlessly; with deliberate cruelty or callousness
Source: WordNetA man who sees another man on the street corner with only a stump for an arm will be so shocked the first time he'll give him sixpence. But the second time it'll only be a three penny bit. And if he sees him a third time, he'll have him cold-bloodedly handed over to the police. Bertolt Brecht
he cold-bloodedly planned the murder of his boss Source: Internet