Compassionless is an adjective used to describe someone or something that lacks empathy and understanding towards others. Its synonyms include heartless, unfeeling, callous, unsympathetic, and indifferent. These words describe the attitude and behavior of a person who is cold and unresponsive towards others' situations and needs. Others include cruel, ruthless, savage, severe, and stern. All these words suggest a lack of kindness and tenderness, indicating a disregard for the emotional or physical experiences of others. Conversely, compassionate people are empathetic, warm, and responsive to others, demonstrating kindness and care towards others. Words that signify this character include merciful, generous, loving, caring, and tenderhearted.