When Molly returned to her grade school thirty years later, it was clear that the building was defunct as a school, since the windows were broken out, the brick walls crumbled and the building was ready to fall down.
Since the warranty was defunct, it would've cost more to fix than the price of a new one.Waiters and bartenders who don't have experience will often claim to have worked for establishments that are...
It means dead or inactive; having ceased to exist. It's an adjective. "The toaster became defunct because I blew it up while trying to make toast." or "Dinosaurs are a defunct species."