The Collaborative International Dictionary of English v.0.48:

Unsupported \Unsupported\
   See supported.

WordNet (r) 3.0 (2006):

unsupported
    adj 1: not sustained or maintained by nonmaterial aid;
           "unsupported accusations" [ant: supported]
    2: not held up or borne; "removal of the central post left the
       roof unsupported" [ant: supported]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "unsupported":
   alienated, alone, aloof, apart, baseless, companionless, detached,
   empty, friendless, groundless, homeless, idle, ill-founded,
   inconclusive, indecisive, insular, isolated, kithless, lone,
   lonely, lonesome, not following, not proved, removed, rootless,
   separate, separated, single-handed, solitary, solo, unabetted,
   unaccompanied, unaided, unascertained, unassisted, unattended,
   unattested, unauthenticated, unbased, uncertified, unconfirmed,
   uncorroborated, undemonstrated, undetermined, unescorted,
   unestablished, unfixed, unfounded, ungrounded, unproved, unproven,
   unseconded, unsettled, unshown, unsubstantiated, unsupportable,
   unsupported by evidence, unsustainable, unsustained, untenable,
   untested, untried, unvalidated, unverified, unwarranted, vain,
   withdrawn, without basis, without foundation, without grounds