The Collaborative International Dictionary of English v.0.48:

Unproved \Unproved\
   See proved.

WordNet (r) 3.0 (2006):

unproved
    adj 1: not proved; "unproved allegations"; "unproved
           assumptions" [syn: unproved, unproven] [ant:
           proved, proven]

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "unproved":
   aberrant, abroad, adrift, all abroad, all off, all wrong, amiss,
   apocryphal, askew, astray, at fault, awry, beside the mark,
   corrupt, deceptive, defective, delusive, deviant, deviational,
   deviative, distorted, errant, erring, erroneous, fallacious, false,
   faultful, faulty, feeble, flawed, flimsy, groundless, heretical,
   heterodox, illogical, illusory, inconclusive, indecisive,
   insubstantial, nonofficial, not following, not proved, not right,
   not true, off, off the track, out, peccant, perverse, perverted,
   poor, self-contradictory, straying, unascertained, unattested,
   unauthentic, unauthenticated, unauthoritative, uncertified,
   unchecked, unconfirmed, uncorroborated, undemonstrated,
   undetermined, unestablished, unfactual, unfixed, unfounded,
   unofficial, unorthodox, unpracticed, unproven, unrigorous,
   unsettled, unshown, unsound, unsubstantial, unsubstantiated,
   unsupported, unsupported by evidence, unsustained, untested,
   untried, untrue, unvalidated, unverified, unwarranted, weak, wide,
   without basis, without grounds, wrong