Option 1 -> refined - This is a synonym of genteel (meaning cultured/polished), not an antonym.
Option 2 -> colloquial - This means informal or conversational, but doesn't directly oppose the refined nature of genteel.
Option 3 -> amicable - This means friendly, which is unrelated to the refinement aspect of genteel.
Option 4 -> uncouth - This means lacking refinement, crude, or ill-mannered, making it the direct opposite of genteel.
Hence, Option 4: uncouth -> Genteel describes someone refined and well-mannered, while uncouth describes someone lacking refinement and grace, making them perfect antonyms -> correct