n.无礼
I must apologize for my discourtesy in arriving late.
我要为迟到失礼而道歉.
I was amazed by their discourtesy and lack of professionalism.
他们的无礼和不专业让我震惊。
He was insensitive to all kinds of discourtesy.
他脸皮很厚,对随便什么侮辱都不在乎.