悪わるく言いう

expression, godan verb (-u)

speak badly of; bad-mouth

Used when criticizing someone or saying negative things about them, often behind their back.

• 彼かれはいつも人ひとのことを悪わるく言いう。

  He always speaks badly of others.

• 陰かげで悪わるく言いうのはよくない。

  It's not good to bad-mouth people behind their backs.