The word "most aftermost" means the furthest back or rear of something. Therefore, its antonyms would be words that describe the opposite meaning. Some antonyms for "most aftermost" could be "front," "foremost," "leading," or "first." These words describe positions that are at the front or beginning of something, rather than the back. Other antonyms for "most aftermost" may include "ahead," "forward," "progressive," and "advancing." Each of these antonyms refers to a position that is advancing or moving forward, as opposed to remaining at the back. Understanding antonyms can help us better comprehend the meaning of words and their usages.