From The Collaborative International Dictionary of English v.0.48:

nonfunctional \nonfunctional\ adj.
   1. Not having or performing a function. [Narrower terms:
      {cosmetic, decorative, ornamental ] Also See:
      unserviceable. functional
      [WordNet 1.5]

   2. Not performing or able to perform its regular function;
      as, the yard was littered with nonfunctional vehicles
      waiting to be repaired. [Narrower terms: {down(predicate)
      ]. Antonym: functioning.

   Syn: malfunctioning, unserviceable, out of order.
        [WordNet 1.5] nonglutenous
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