Zhè zhǒng xíngwéi shì duì tārén de yánzhòng wūmiè.
This behavior is a serious slander against others.
Tips
usage
污蔑 specifically means to smear someone with false accusations. It implies deliberate malice. A similar word is 诽谤 (fěibàng), which emphasizes spreading falsehoods; 污蔑 often implies a more visceral attack on character.
