cold-bloodedly
Adverb
Meaning
emotionlessly and heartlessly; with deliberate cruelty or callousness
Source: WordNetSynonyms
coldly
cruelly
wantonly
bestially
soullessly
harshly
in cold blood
mercilessly
inhumanly
callously
unfeelingly
pitilessly
sinisterly
brutishly
brutely
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Antonyms
Examples
A 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.
he cold-bloodedly planned the murder of his boss