Being merciless can be defined as lacking compassion and the willingness to forgive or grant mercy, and choosing harshness and severity instead. Antonyms for being merciful include words such as cruel, heartless, callous, ruthless, and unforgiving. These words imply a lack of empathy and kindness toward others, often resulting in harsh actions or words that can cause harm or suffering. Being merciful is a trait that reflects a sense of grace, forgiveness, and compassion towards others, while being merciless is a stark contrast that reveals a lack of empathy and understanding. In short, being merciful is a positive trait that promotes peace and harmony, while being merciless often leads to conflict and pain.