Oldie is a term that describes something or someone that has been around for a longer period than average. While the word most oldie is often used to describe something that is very old, it is important to note that there are many antonyms or words that mean the opposite of 'most oldie'. These antonyms include modern, contemporary, newfangled, fresh, and innovative. Unlike most oldie, these words suggest that something is newly introduced, modern, or innovative. These antonyms suggest something that is up-to-date, modern, and holds a new concept or innovation. Thus, when looking for the opposite of most oldie, one should consider words that suggest freshness and novelty.