adjective

characterized by exaggerated or affected politeness, refinement, or respectability.

her genteel upbringing

refined,respectable,polished,decorous,proper,polite,correct,seemly,well mannered,well bred,cultivated,cultured,sophisticated,courteous,ladylike,gentlemanly,civil,elegant,stylish,urbane,civilized,courtly,dignified,gracious,punctilious,affected,posh,mannerly