Synonyms and related words :
absonant, contradictory, contrary to reason, fallacious, faulty, feeble, flawed, flimsy, groundless, illogical, inauthentic, incongruous, inconsequent, inconsequential, inconsistent, indecisive, indefinite, indeterminate, insubstantial, invalid, irrational, loose, nonscientific, not following, not proved, open, paralogical, poor, reasonless, self-annulling, self-contradictory, self-refuting, senseless, unascertained, unattested, unauthentic, unauthenticated, uncertain, uncertified, unconfirmed, unconnected, uncorroborated, undemonstrated, undetermined, unestablished, unfinished, unfixed, unfounded, unphilosophical, unproved, unproven, unreasonable, unresolved, unrigorous, unscientific, unsettled, unshown, unsound, unsubstantial, unsubstantiated, unsupported, unsupported by evidence, unsustained, untested, untried, unvalidated, unverified, weak, without basis, without grounds, without reason