well-bred

adjective2

1. •
   Of good breed.
2. •
   Well-mannered and refined because of a good upbringing and education (and, originally and literally but usually not in current usage, because well-born in a eugenic sense).

   • Ideally you should relax—though well-bred English people do no feel entirely at ease in a room full of naked strangers beating one another. — 1986