Having mercy is often associated with compassion, sympathy, and kindness. The antonyms for having mercy include being merciless, cruel, heartless, unkind, and unsympathetic. In contrast to showing mercy, being merciless means lacking pity or compassion towards others, while cruelty entails intentionally causing pain and suffering. Heartlessness implies a lack of empathy or concern, and unkindness means showing no consideration for the welfare or feelings of others. Similarly, unsympathetic means lacking in compassion or understanding. Therefore, understanding antonyms for "having mercy" helps to illustrate the importance of mercy in interpersonal relationships and the consequences of its absence.