High-ranking is the best antonym for low-ranking, as it implies a position of great importance, authority, or respect. Other antonyms for low-ranking could include prestigious or influential. High-ranking refers to a position of power or authority, whereas prestigious and influential denote status and reputation. These antonyms are often used in political, military or business context, but can also apply to social or personal matters. It is essential to use appropriate antonyms in communication to convey the intended meaning effectively. Using the appropriate antonym can also improve the quality of writing, making it clear, consistent and engaging.