To persist in one's wrongdoings without any regret, often relying on some backing or a strong sense of self-righteousness. To obstinately refuse to repent.
尽管家人苦口婆心地劝导，他依然对自己的错误行为怙终不悔
Despite his family's earnest and heartfelt advice, he stubbornly persisted in his wrongdoings without any sign of repentance.
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