The word "hard-heartedness" refers to a lack of compassion or empathy towards others. Antonyms for this term include sensitivity, kindness, empathy, and sympathy. These are all characteristics that involve a genuine concern for the feelings of others and a desire to help them in any way possible. A person who is not hard-hearted is often described as gentle, caring, and compassionate. They are able to put themselves in other people's shoes and understand their perspectives. By practicing these qualities, individuals can create a more positive and supportive environment, which can help to improve the well-being of those around them.