1N-UNCOUNT 下流;有伤风化;猥亵 If you talk about the indecency of something or someone, you are indicating that you find them morally or sexually offensive. 下流;有伤风化;猥亵
...the indecency of their language. [+ of]
他们言语粗俗
2N-UNCOUNT 非法性行为 In law, an act of indecency is an illegal sexual act. 非法性行为
They were found guilty of acts of gross indecency.