The antonyms for the phrase "found a use" may include words such as "unutilized," "discarded," "wasted," or "unused." These words suggest that the object or item in question has not been given a purpose, or has been deemed useless. Other antonyms may include words such as "abandoned," "neglected," "ignored," or "forgotten," which imply that the object has been left behind or neglected by its owner or caretaker. In contrast to "found a use," these antonyms suggest that the object or item has no value or practical application, and has therefore been discarded or forgotten.