The phrase "most oldline" refers to something that is established and traditional. Antonyms for this phrase would be words that refer to things that are modern and new. Some examples of antonyms for "most oldline" include terms like innovative, avant-garde, cutting-edge, and contemporary. These antonyms suggest things that are fresh and up-to-date, rather than being stuck in the past. Other antonyms for "most oldline" include words like experimental, radical, and forward-thinking. These words suggest a level of exploration and risk-taking that is not typically associated with established traditions.