The Collaborative International Dictionary of English v.0.48:

Unmade \Un*made"\, a.
   1. [Pref. un- not + made.] Not yet made or formed; as, an
      unmade grave. --Shak.
      [1913 Webster]

   2. [Properly p. p. of unmake.] Deprived of form, character,
      etc.; disunited.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unmade
    adj 1: (of a bed) not having the sheets and blankets set in
           order; "an unmade bed with tangled sheets and blankets"
           [ant: made]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "unmade":
   ad-lib, caught napping, caught off balance, caught short,
   extemporaneous, extemporized, haphazard, hasty, impromptu,
   improvised, makeshift, precipitate, rough-and-ready, snap,
   surprised, taken aback, taken by surprise, taken unawares,
   tripped up, unarranged, unbegotten, unbegun, unborn, unconceived,
   unconcocted, uncontrived, uncreated, undeliberated, undevised,
   unhatched, unmanufactured, unorganized, unplanned, unpremeditated,
   unprepared, unprimed, unproduced, unready, unstudied