Rude

Antonyms of rude:
civil, polite, later, refined, processed, late, civilized, cultured, elegant, humane, tender, courtly, delicate, graceful, nice, urbane.
Examples of usage:
  1. It's not like him to be rude.
    "Aurora the Magnificent", Gertrude Hall.
  2. On a rude bench in front of his house sat the chief.
    "The Coral Island", R.M. Ballantyne.
  3. Again silence fell upon the room- a silence so profound that every insect's stir was a rude interruption.
    "Victor Ollnee's Discipline", Hamlin Garland.