apocryphal groundless inconclusive indecisive nonofficial not following not proved unascertained unattested unauthentic unauthenticated unauthoritative uncertified unchecked unconfirmed uncorroborated undetermined unestablished unfixed unfounded unofficial unpracticed unproved unproven unsettled unshown unsubstantiated unsupported unsupported by evidence unsustained untested untried unvalidated unverified unwarranted without basis without grounds