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Adjective: nonfunctional
  1. Not having or performing a function
  2. Not performing or able to perform its regular function
    "a nonfunctional valve";
    - malfunctioning

See also: amiss, awry, bad, cosmetic, decorative, defective, function, haywire, nonstructural, ornamental, out of whack, purpose, role, run-down, unserviceable, use, wrong

Antonym: functional, functioning