Antonyms for "more used up" include "less worn," "fresh," and "new." If something is "less worn," it means it has not been used as much and is still in good condition. "Fresh" describes something that is new or recently made and has not been used yet. "New" speaks for itself; it means something that has not been used before and is in pristine condition. When looking for the opposite of "more used up," it is important to keep in mind the context and purpose of the object in question. For example, a car may be "less worn," but a book may be "fresh" or "new.