The Collaborative International Dictionary of English v.0.48:

Unconfirmed \Unconfirmed\
   See confirmed.

WordNet (r) 3.0 (2006):

unconfirmed
    adj 1: not finally established or settled; "an unconfirmed
           letter of credit"; "unconfirmed rumors" [ant:
           confirmed]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "unconfirmed":
   apocryphal, groundless, inconclusive, indecisive, nonofficial,
   not following, not proved, unascertained, unattested, unauthentic,
   unauthenticated, unauthoritative, uncertified, unchecked,
   uncorroborated, undemonstrated, undetermined, unestablished,
   unfixed, unfounded, unofficial, unproved, unproven, unsettled,
   unshown, unsubstantiated, unsupported, unsupported by evidence,
   unsustained, untested, untried, unvalidated, unverified,
   unwarranted, without basis, without grounds, ,