The word "most gone-by" can be defined as something that has passed or is over, making its antonyms words that represent the present or future. Some antonyms for "most gone-by" could include words such as "current," "present," "modern," "contemporary," "up-to-date," "new," or "future." These words suggest that there is still time to explore new possibilities and opportunities in the present or future. While "most gone-by" carries a nostalgic or sentimental tone, its antonyms imply forward-thinking and excitement for what is to come.