I was amazed by their discourtesy and lack of professionalism.

我为他们的无礼和职业精神的缺乏所震惊。

A slow courtesy is a discourtesy.

迟来的礼貌就是失礼。

Could share in that discourtesy of death.

竟会分担那死亡的暴虐无礼。

I must apologize for my discourtesy in arriving late.

我要为迟到失礼而道歉。

The customer complained to the manager of the discourtesy of an assistant.

顾客向经理控告一个营业员的失礼。