Discourteous means not displaying good manners, politeness, or consideration for others. Some suitable antonyms for discourteous are polite, courteous, considerate, respectful, civil, gracious, and kind. A polite person is someone who is well-mannered and shows kindness and respect towards others. Courteous people are courteous and considerate of other people's feelings, needs, and opinions. Respectful people show dignity and respect towards others. A civil person is someone who is courteous and well-behaved in public. Graciousness refers to being courteous, kind, and showing good manners. And finally, kind people display a friendly and compassionate attitude towards others. These antonyms convey the opposite meaning of discourteous and can be used in various situations.