Callous/ˈkæləs/ Definition 1 of 3Pro Tip 1/3Negative Emotion Callous is used to express a strong negative feeling towards someone's behavior. His callous remark about the poverty-stricken areas shocked everyone. Pro Tip 2/3Insensitive Attitude Use 'callous' to describe a person who does not care about others' feelings. She was callous to the suffering of her employees during the layoffs. Pro Tip 3/3Emotional Impact The word often implies that the callous person causes emotional pain. The manager's callous decision left the team feeling undervalued and hurt.