宽恕 means 'to forgive' and is more formal and weighty than the everyday 原谅 (yuánliàng, HSK4). It often implies a moral or spiritual forgiveness for a serious offense, while 饶恕 (ráoshù, HSK7) specifically suggests sparing someone's life or forgiving a grave sin. 宽容 (kuānróng, HSK7) is about being tolerant or lenient, not necessarily forgiving a specific wrong.