WordNet (r) 3.0 (2006):

unaffiliated
    adj 1: not affiliated

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "unaffiliated":
   alien, apart, detached, disconnected, discrete, disjunct,
   disrelated, dissociated, exotic, extraneous, foreign,
   incommensurable, incomparable, independent, insular, irrelative,
   isolated, other, outlandish, removed, segregate, separate,
   separated, strange, unallied, unassociated, unconnected,
   unrelatable, unrelated