悪口 わるぐち
waruguchi

Noun

1. (verbal) abuse; speaking ill of people; bad-mouthing; name-calling; slander; abusive language; insulting remarks

かげ他人 たにん悪口 わるくち うべきでない。
kagede taninno waruguchio iubekidenai.
You should not speak ill of others behind their backs.
Other forms: