The Collaborative International Dictionary of English v.0.48:

Disuse \Dis*use"\ (?; see Dis-), v. t. [imp. & p. p.
   Disused; p. pr. & vb. n. Disusing.]
   1. To cease to use; to discontinue the practice of.
      [1913 Webster]

   2. To disaccustom; -- with to or from; as, disused to toil.
      "Disuse me from . . . pain." --Donne.
      [1913 Webster]

WordNet (r) 3.0 (2006):

disused
    adj 1: no longer in use; "obsolete words" [syn: disused,
           obsolete]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "disused":
   abandoned, abjured, antiquated, antique, archaic, castaway, dated,
   dead, derelict, deserted, discarded, discontinued, done with,
   extinct, forsaken, gone out, gone-by, jettisoned, left, marooned,
   neglected, not worth saving, obsolescent, obsolete, old,
   old-fashioned, on the shelf, out, out of style, out of use,
   out-of-date, outdated, outmoded, outworn, passe, past, past use,
   pensioned off, relinquished, renounced, resigned, retired, run out,
   superannuate, superannuated, superseded, unused, worn-out