unquestionable

• POS: Adjective
• HYPHEN: un=ques=tion=a=ble

CIDE DICTIONARY

unquestionable, a. 

•  Not questionable; as, an unquestionable title.  [1913 Webster]
•  Not inviting questions or conversation.  Shak.  [1913 Webster]

OXFORD DICTIONARY

unquestionable, adj. that cannot be disputed or doubted.

Derivative

unquestionability n. unquestionableness n. unquestionably adv.

THESAURUS

unquestionable

absolute, actual, admitting no question, ascertained, attested, authenticated, believable, bona fide, categorically true, certain, certified, clear, colorable, conceivable, conclusive, confirmable, confirmed, corroborated, credible, deep-seated, definite, demonstrable, demonstratable, demonstrated, dependable, determined, documentary, effectual, esoteric, established, factual, fiduciary, flat, genuine, historical, immanent, implanted, implicit, inalienable, inappealable, incontestable, incontrovertible, indisputable, indubitable, indwelling, infixed, ingrained, inherent, inner, internal, intrinsic, inward, inwrought, irreducible, irrefragable, irrefutable, manifest, not in error, objectively true, obvious, patent, plausible, positive, private, provable, proved, real, reliable, resident, secret, self-evident, subjective, substantiated, sure, sure-enough, tenable, testable, true, true as gospel, trustworthy, trusty, truthful, unalienable, unanswerable, unchallengeable, unconfutable, unconfuted, uncontestable, undeniable, undenied, undoubted, unequivocal, unerroneous, unexceptionable, unfallacious, unfalse, unimpeachable, unmistakable, unmistaken, unrefutable, unrefuted, up-and-down, validated, veracious, verifiable, verified, veritable, very, well-founded, well-grounded, worthy of faith

ROGET THESAURUS

unquestionable

Certainty

N certainty, necessity, certitude, surety, assurance, dead certainty, moral certainty, infallibleness, infallibility, reliability, indubitableness, inevitableness, unquestionableness, gospel, scripture, church, pope, court of final appeal, res judicata, ultimatum positiveness, dogmatism, dogmatist, dogmatizer, doctrinaire, bigot, opinionist, Sir Oracle, ipse dixit, fact, positive fact, matter of fact, fait accompli, certain, sure, assured, solid, well-founded, unqualified, absolute, positive, determinate, definite, clear, unequivocal, categorical, unmistakable, decisive, decided, ascertained, inevitable, unavoidable, avoidless, ineluctable, unerring, infallible, unchangeable, to be depended on, trustworthy, reliable, bound, unimpeachable, undeniable, unquestionable, indisputable, incontestable, incontrovertible, indubitable, irrefutable, conclusive, without power of appeal, indubious, without doubt, beyond a doubt, without a shade or shadow of doubt, without question, beyond question, past dispute, clear as day, beyond all question, beyond all dispute, undoubted, uncontested, unquestioned, undisputed, questionless, doubtless, authoritative, authentic, official, sure as fate, sure as death and taxes, sure as a gun, evident, self-evident, axiomatic, clear, clear as day, clear as the sun at noonday, certainly, for certain, certes, sure, no doubt, doubtless, and no mistake, flagrante delicto, sure enough, to be sure, of course, as a matter of course, a coup sur, to a certainty, in truth, at any rate, at all events, without fail, coute que coute, coute qu'il coute, whatever may happen, if the worst come to the worst, come what may, happen what may, come what will, sink or swim, rain or shine, cela va sans dire, there is no question, no question, not a shadow of doubt, there is not a shadow of doubt, the die is cast, facts are stubborn things.