Source : Webster's Revised Unabridged Dictionary (1913)

Unbacked \Un*backed"\, a.
   1. Never mounted by a rider; unbroken. ``Unbacked colts.''
      --Shak.

   2. Not supported or encouraged; not countenanced; unaided.
      --Daniel.

Source : WordNet®

unbacked
     adj : unsupported by other people [syn: {single-handed}, {unassisted}]