The Collaborative International Dictionary of English v.0.48:

Unsanctioned \Unsanctioned\
   See sanctioned.

WordNet (r) 3.0 (2006):

unsanctioned
    adj 1: without explicit official permission; "unsanctioned use
           of company cars"

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "unsanctioned":
   banned, barred, contraband, forbade, forbid, forbidden, illegal,
   illicit, nonpermissible, not permitted, off limits, out of bounds,
   outlawed, prohibited, ruled out, taboo, tabooed, unallowed,
   unauthorized, under the ban, unlawful, unlicensed, unpermissible,
   untouchable, verboten, vetoed