When something goes unused, it can be described in many different ways. Some common synonyms for unused include "idle," "untouched," "neglected," "vacant," "unutilized," "unoccupied," "surplus," "spare," "extra," "redundant," "superfluous," "unused," "dormant," "inactive," "unemployed," "unemployed," "free," "available," and "unclaimed." Each of these words carries its own nuances and connotations, so it's important to choose the right one depending on the context. Whether you're talking about unused resources, unused time, or unused space, there's sure to be a synonym that captures the essence of what you're trying to convey.