From The Collaborative International Dictionary of English v.0.48 :
Unfree \Un*free"\, a. Not free; held in bondage. [1913 Webster] There had always been a slave class, a class of the unfree, among the English as among all German peoples. --J. R. Green [1913 Webster]From WordNet (r) 3.0 (2006) :
unfree adj 1: held in servitude; "he was born of slave parents" [ant: free] 2: hampered and not free; not able to act at will [ant: free]