WordNet sense 1 (marked by refinement in taste and manners):

civilized, cultivated, cultured, genteel, civilised

WordNet sense 2 ((used of persons and their behavior) cultivated and genteel):

refined

WordNet sense 3 (not rude; marked by satisfactory (or especially minimal) adherence to social usages and sufficient but not noteworthy consideration for others):

civil

WordNet sense 4 (exhibiting courtesy and politeness):

courteous, gracious, nice

WordNet sense 5 (socially correct in behavior):

mannerly