The word "outdatedness" implies something that is no longer relevant, up-to-date or fashionable. Its antonyms, on the other hand, would suggest something that is modern, trendy, and up-to-date. Some possible antonyms for "outdatedness" include freshness, novelty, modernity, contemporaneity, and innovation. These words describe items, ideas or concepts that are new, exciting, and relevant to the present day. In the fast-paced world that we live in, it's essential to keep up with the latest trends and innovations. By doing so, we can avoid being labeled as outdated and continue to remain relevant and progressive.