politesse

/ˌpɑlɪˈtɛs/
noun
  1. Formal politeness and good manners, especially in social situations; often implies a polished or refined style.
    • In high society, politesse is expected at every formal gathering.
    • She was known for her old-fashioned politesse, always writing thank-you notes by hand.
    • The diplomat's politesse helped ease tensions during the negotiation.
Antonyms