Impolite (adjective)

1. Not showing good manners or respect for others; rude.
2. Not in keeping with good social customs or etiquette.
3. Not showing consideration for the feelings or wishes of others.

Origin:

From the latin in- (not) + politus (polite), from polire (to polish).

Examples:

1. His impolite behavior at the dinner party caused everyone to feel uncomfortable.
2. Her impolite comment was not well received by the audience.
3. It was impolite of him to interrupt the conversation.
4. His impolite attitude made it difficult to work with him.
5. The impolite service at the restaurant made the customer decide not to return.