Haram Speech & character
Yes. The Quran sets a severe punishment for those who accuse chaste people without four witnesses (24:4), and curses those who slander believing women who never thought of evil (24:23). It is a major sin.
وَٱلَّذِينَ يَرْمُونَ ٱلْمُحْصَنَٰتِ ثُمَّ لَمْ يَأْتُوا۟ بِأَرْبَعَةِ شُهَدَآءَ فَٱجْلِدُوهُمْ ثَمَٰنِينَ جَلْدَةًۭ وَلَا تَقْبَلُوا۟ لَهُمْ شَهَٰدَةً أَبَدًۭا ۚ وَأُو۟لَٰٓئِكَ هُمُ ٱلْفَٰسِقُونَ ﴿٤﴾
凡告发贞节的妇女，而不能举出四个男子为见证者， 你们应当把每个人打八十鞭，并且永远不可接受他们的见证。这等人是罪人。
إِنَّ ٱلَّذِينَ يَرْمُونَ ٱلْمُحْصَنَٰتِ ٱلْغَٰفِلَٰتِ ٱلْمُؤْمِنَٰتِ لُعِنُوا۟ فِى ٱلدُّنْيَا وَٱلْءَاخِرَةِ وَلَهُمْ عَذَابٌ عَظِيمٌۭ ﴿٢٣﴾
凡告发贞节的而且天真烂漫的信女的人，在今世和后世，必遭诅咒，他们将受重大的刑罚。
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Yes. The Quran sets a severe punishment for those who accuse chaste people without four witnesses (24:4), and curses those who slander believing women who never thought of evil (24:23). It is a major sin.
