1. Antonyms for Baseborn include aristocratic, blue-blooded, genteel, gentle, grand, great, high, highborn, highbred and lofty

2. Courtly adjective ceremonious, civil, formal, obliging, refined, polite, dignified, stately, aristocratic, gallant, affable, urbane, decorous, chivalrous, highbred a large man with a gently, Courtly manner Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition