[adj] without compunction or human feeling; "in cold blood"; "cold-blooded killing"; "insensate destruction" [adj] (zoology) having cold blood (in animals whose body temperature is not internally regulated)
cold, heterothermic, inhuman, inhumane, insensate, poikilothermic, poikilothermous
warm-blooded
affectless, anesthetized, apathetic, arctic, autistic, barbaric, barbarous, blunt, brutal, callous, calloused, catatonic, chill, chilly, cold, cold as charity, cold of heart, coldblooded, coldhearted, cool, cruel, cryogenic, cryological, dispassionate, dr