The term country-bred implies a certain sense of rural upbringing, often of a person who has been raised away from urban centers. Antonyms for the word would, therefore, indicate the opposite of that kind of upbringing. Words like urban, cosmopolitan, and metropolitan would come to mind as possible antonyms. Other candidates could include modern, sophisticated, and worldly. In each of these alternatives, one would find elements of city living, with its more diverse exposure to culture and education. The country-bred would be someone who might have limited experience of the world outside their immediate area, while someone from a cosmopolitan background could have traveled extensively and be knowledgeable about different lifestyles and worldviews.