Most old-hat is a term used to describe something that is outdated, conventional, or overused. The antonyms of this word can be described as modern, innovative, avant-garde, or trailblazing. These words are used to describe ideas, concepts, and products that are relatively new and cutting-edge. The antonyms for most old-hat can also include terms such as fresh, original, newfangled, and pioneering. These words are used to describe something that is innovative and exciting, that breaking with the old and embracing the new is essential to push ourselves forward. In summary, the antonyms for most old-hat are innovative, modern, trailblazing, avant-garde, fresh, original, and newfangled.