unusable

from WordNet (r) 3.0 (2006)

unusable
    adj 1: not capable of being used [syn: {unserviceable},
           {unusable}, {unuseable}]

from The Collaborative International Dictionary of English v.0.48

Unusable \Unusable\
   See {usable}.

from Moby Thesaurus II by Grady Ward, 1.0

19 Moby Thesaurus words for "unusable":
      functionless, impractical, in disrepair, inapplicable, inoperable,
      inoperative, nonfunctional, nonutilitarian, otiose, out of order,
      out of whack, unconducive, unemployable, unfit, unhelpful,
      unserviceable, unsuitable, unworkable, useless