Impossible to deny or disprove:
— An irrefutable argument.

synonyms: incontrovertible, positive.

Roget 478: demonstrating etc. v., demonstrative, demonstrable; probative, unanswerable, conclusive; apodictic^†, apodeictic^†, apodeictical^†; irresistible, irrefutable, irrefragable; necessary.    categorical, decisive, crucial.    demonstrated etc. v.; proven; unconfuted^†, unanswered, unrefuted^†; evident etc. 474.    deducible, consequential, consectary^†, inferential, following.    [demonstrated to one's satisfaction] convincing, cogent, persuasive (believable) 484.    ... show more

Roget 474: certain, sure, assured etc. v.; solid, well-founded.    unqualified, absolute, positive, determinate, definite, clear, unequivocal, categorical, unmistakable, decisive, decided, ascertained.    inevitable, unavoidable, avoidless^†; ineluctable.    unerring, infallible; unchangeable etc. 150; to be depended on, trustworthy, reliable, bound.    unimpeachable, undeniable, unquestionable; indisputable, incontestable, incontrovertible, indubitable; irrefutable etc. (proven) 478; 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.    ... show more

Polish: święty, niepodważalny, niezbity