adj. 25B6; adjective INCONTROVERTIBLE, incontestable, undeniable, irrefutable, beyond dispute, unassailable, unquestionable, beyond question, indubitable, not in doubt, beyond doubt, beyond a shadow of a doubt, unarguable, undebatable, airtight, watertight; unequivocal, unmistakable, certain, sure, definite, definitive, proven, decisive, conclusive, demonstrable, self-evident, clear, clear-cut, plain, obvious, manifest, patent, palpable.
questionable.