unfunctional

/ʌnˈfʌŋkʃənəl/
adjective
  1. Not working or operating properly; not serving a useful purpose.
    • The old computer was completely unfunctional and wouldn't even turn on.
    • After the storm, the phone lines were unfunctional for several hours.
    • This unfunctional design looks nice but doesn't actually help anyone use the app.
Antonyms
What does "unfunctional" mean? | whatsthatwordmean | whatsthatwordmean