Daily Chinese Idiom Guessing Game
To be unreasonable and refuse to listen to reason; to act in a crude and stubborn manner.
态度粗暴，不讲道理。
毛泽东《关于正确处理人民内部矛盾的问题》在我们社会里，也有少数不顾公共利益，蛮不讲理，行凶犯法的人。”
He was so angry that he became completely unreasonable, refusing to listen to any explanation.