The phrase "worn out" implies that something has become old, overused, and no longer functioning effectively. Synonyms for this term include terms such as exhausted, fatigued, depleted, drained, and fatigued. These words paint a picture of something that has been used too much and has lost its efficiency. Other similar terms include banged-up, bedraggled, dashed, dog-tired, forlorn, and faded. These words can be used to describe everything from a person who has worked too hard to an object that has seen better days. So when something is past its prime, the English language provides ample synonyms to describe its state of being.