callous
adj.showing no care or sympathy for the feelings or suffering of other people. You use this to describe someone who is cold and unkind.
adj.exhibiting a cruel disregard for others; insensitive and unsympathetic. Often used to describe individuals in positions of power or specific harmful actions.
“The manager made a callous remark about the staff.”
“The company's callous decision to fire the workers right before the holidays sparked a massive public protest.”
“His callous indifference to the plight of the refugees was widely condemned by international human rights organizations as a violation of basic moral standards.”
Typically used as an adjective to describe people, attitudes, or actions. It can be used both before a noun or after a linking verb.
“How to keep the audience on board with someone who is callous and indifferent?”
From Latin callōsus (“hard-skinned”), from callum (“hardened skin”) + -ōsus.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.