Mercy/ˈmɜːrsi/ Definition 1 of 4Pro Tip 1/3Authority Dependent Often used when someone in power shows kindness to someone being punished. The king had mercy on the rebellious knight. Pro Tip 2/3Not Obligatory 'Mercy' implies a choice to be kind when harshness could be justified. Despite our rivalry, she showed me mercy. Pro Tip 3/3Emotional Appeal Pleading for mercy often displays vulnerability or desperation. He dropped to his knees and begged for mercy.