apocryphal groundless inconclusive indecisive nonofficial not following not proved unascertained unattested unauthentic unauthenticated unauthoritative unchecked unconfirmed 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