The opposite of being warm-hearted can be described as cold-hearted, callous or unfeeling. A person who lacks warmth is unlikely to show empathy, kindness or generosity towards others. They may be indifferent to the needs and feelings of people around them, and may even disregard their own emotions. Unlike someone who is more warm-hearted, a cold-hearted person may react with hostility or indifference to the suffering of others, and may find it difficult to build meaningful relationships with those they encounter. Being cold-hearted is not conducive to a happy and fulfilled life, as it can lead to loneliness, isolation and a lack of social support.