What is callous defined?

Callous is an adjective that describes a person or their behavior as cruel or insensitive, disregard for the feelings of others. A callous person may be indifferent to suffering, lacking empathy, unsympathetic, or unfeeling. The term can also refer to a physical condition affecting skin or other tissues, particularly in response to repeated friction or pressure. A callus forms as a thickened area of skin to protect against further damage or irritation. In a figurative sense, callousness may reflect an emotional barrier or numbness that prevents someone from feeling or understanding the pain of others.