1. compassion Mercy is the exercise of less severity than one deserves, or in a more extended sense, the granting of kindness or favor beyond what one may rightly claim. Grace is favor, kindness, or b Synonyms: mercy, benevolence, favor, kindness, mildness, benignity, forbearance, lenience, pardon, blessing, forgiveness, leniency, pity, clemency, gentleness, lenity, tenderness, compassion, grace Antonyms: cruelty, implacability, punishment, rigor, sternness, hardness, justice, revenge, severity, vengeance, harshness, penalty