* Rude: This is the most direct and general antonym, meaning lacking in manners and consideration for others.
* Discourteous: This is a more formal way of saying rude, specifically referring to a lack of courtesy.
* Impertinent: This implies a disrespectful or insolent attitude.
* Inconsiderate: This suggests a lack of thought for others' feelings or needs.
* Boorish: This refers to someone who is rough, insensitive, and lacking in social graces.
* Uncivil: This is a general term for behavior that is not polite or respectful.
The best antonym will depend on the specific situation and the level of formality required.