The phrase "most lowbred" refers to someone who is uncivilized and lacks manners. Some antonyms for this phrase would be refined, cultured, polite, sophisticated or genteel. A refined person is educated in social etiquette and manners, while a cultured individual has an appreciation for the arts and other cultural pursuits. A polite person is known for being courteous and considerate to others. A sophisticated person is worldly, well-read, and knowledgeable in various topics. Finally, a genteel person is known for their refinement and grace. By knowing these antonyms, one can describe someone as being the opposite of "most lowbred.