noun
malicious gossip; backbiting; speaking ill behind someone's back
Refers to saying bad things about someone when they are not present. Similar to 陰口 (かげぐち), but 陰言 is less common.
See also: 陰口
陰言を言うのはよくない。
It's not good to speak ill of others behind their backs.
彼女はよく陰言をする。
She often engages in backbiting.