The word "un-worldlier" means someone who is not worldly, naive, or unskilled in the ways of the world. Its antonyms would be words that describe someone who is worldly, experienced, or sophisticated. These antonyms include cosmopolitan, knowledgeable, sophisticated, worldly-wise, refined, and polished. A person who is cosmopolitan is well-traveled and familiar with different cultures and cities. Someone who is knowledgeable has a broad range of information and is well-rounded. Sophisticated individuals are wise and cultured, while worldly-wise people have a deep understanding of the ways of the world. Refined and polished people are elegant and have a certain level of grace and poise.