defunct

/dɪˈfʌŋkt/
adjective
  1. No longer existing, working, or in use; dead or extinct.
    • Many defunct social media platforms are forgotten by most users.
    • The old factory has been defunct for over a decade.
    • The species was declared defunct after no sightings for fifty years.
What does "defunct" mean? | whatsthatwordmean | whatsthatwordmean