dis-, 不，非，使相反。courteous, 礼貌的。

1. Staff are often discourteous and sometimes downright rude.

职员常常态度很不礼貌，有时候极其蛮横。

来自柯林斯例句

2. I was offended by his discourteous reply.

他无礼的回答使我很生气.

来自《简明英汉词典》

3. His behaviour was wanting in courtesy , ie discourteous, rude.

他举止没有礼貌.

来自辞典例句

4. It was discourteous of you to arrive late.

你迟到了,真没礼貌.

来自辞典例句

5. Lateness is discourteous to your classmates and to your professor.

迟到是对你同学和教授的不尊敬.

来自互联网