heartless

heartless
heart‧less /ˈhɑːtləs $ ˈhɑːrt-/ adjectivecruel and not feeling any pity:
    How can you be so heartless?
—heartlessly adverb
—heartlessness noun [uncountable]
     

THESAURUS

   ▪ cruel deliberately hurting people or making them suffer: It was cruel to lock him in there all day. | Her father had been very cruel to her when she was a child. | a cruel, selfish woman
   ▪ heartless not feeling any pity and not caring about other people or their problems: How could you be so heartless! | He was cold and heartless and had no concern for the welfare of his employees.
   ▪ sadistic getting pleasure from making other people suffer: a sadistic killer | a sadistic thing to do
   ▪ barbaric extremely cruel, in a way that shocks people: a barbaric punishment | a barbaric sport
   ▪ vicious very violent and cruel, especially by suddenly attacking someone and causing injury to them: a vicious attack on an innocent man | Some dogs can be vicious.
   ▪ brutal very cruel and violent, in a way that shows no human feelings: a brutal dictator | the brutal methods used by the secret police
   ▪ inhumane inhumane conditions, treatment etc are not considered acceptable because they cause too much suffering: the inhumane treatment of prisoners
   ▪ cold-blooded a cold-blooded murder, attack etc is done without showing any feeling or pity for the person who is attacked. A cold-blooded killer kills people without showing any pity: a woman 's cold-blooded murder of her devoted husband | a cold-blooded psychopath