原谅 (yuánliàng) is the everyday word for 'to forgive' in daily conversation, used when someone says sorry for a minor mistake. The more formal 宽恕 (kuānshù) is for serious wrongdoing, often in moral or religious contexts, and 饶恕 (ráoshù) is even stronger, implying sparing from punishment. 包容 (bāoróng) focuses on being tolerant of someone's shortcomings rather than forgiving a specific offense.