Unserviceable is an adjective used to describe something that cannot be repaired and is no longer functional or useful. There are several synonyms for this term, including unusable, inoperable, non-functional, broken-down, and worthless. These words all convey the idea of something that can no longer be used for its intended purpose. Other synonyms include ineffective, inefficient, and impractical, which suggest that although the item may still technically work, it is not suitable or practical for use. Regardless of which synonym is used, the overall sense is of an object or system that is malfunctioning or unable to perform as expected.