baseless, empty, feeble, flimsy, groundless, idle, ill-founded, inconclusive, indecisive, insubstantial, not following, not proved, poor, unascertained, unattested, unauthenticated, unbased, uncertified, unconfirmed, uncorroborated, undemonstrated, undetermined, unestablished, unfixed, unfounded, ungrounded, unproved, unproven, unrigorous, unsettled, unshown, unsound, unsubstantial, unsubstantiated, unsupportable, unsupported, unsupported by evidence, unsustainable, untenable, untested, untried, unvalidated, unverified, unwarranted, vain, weak, without basis, without foundation, without grounds