Unmannerly is an adjective that means rude or impolite. Its antonyms are words with opposite meanings. One antonym for unmannerly is polite. Polite people are considerate of others and act in ways that show respect and good manners. Another antonym is courteous, meaning showing good manners and respect towards others. Courteous people are typically kind, gracious, and well-mannered. Other antonyms include civil, respectful, and refined, all of which describe people who act in a courteous and polite manner. When interacting with others, it is important to strive for manners and respect in all conversations and interactions.