Source : Webster's Revised Unabridged Dictionary (1913)

Unfree \Un*free"\, a.
   Not free; held in bondage.

         There had always been a slave class, a class of the
         unfree, among the English as among all German peoples.
                                                  --J. R. Green

Source : WordNet®

unfree
     adj : hampered and not free; not able to act at will [ant: {free}]