Untreasured refers to something that is not valued or cherished, but there are several synonyms that can be used to convey a similar meaning. One could use the term unappreciated to describe something that is not valued enough. The word unvalued also conveys the same sentiment. Another synonym for untreasured could be underrated, which is often used to describe something that is not fully appreciated for its worth or importance. Similarly, the term unacknowledged can be used to describe something that is not given the recognition or appreciation it deserves. Lastly, unloved can also be used as a synonym for untreasured to describe something that is not cared for or cherished.