Synonyms for Inoperable:

adj.

broken (adjective)
faulty, defective.
impractical/impracticable (adjective)
unusable, unserviceable.

n.

autoimmune, benign, acute, communicable, chronic, congenital, asymptomatic, advanced, catching, clinical. ineffective, futile, worthless, pointless, pathetic, purposeless, faulty, inefficient, defective. inoperable (noun)
unusable, unserviceable.

Other synonyms:

Other relevant words:
clinical, acute, autoimmune, congenital, ineffective, defective, faulty, communicable, benign, pointless, catching, futile, chronic, purposeless, asymptomatic, worthless, inefficient, advanced, pathetic.