Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

assurance; dead certainty, moral certainty; infallibleness &c adj.; infallibility, reliability; indubitableness, inevitableness, unquestionableness†. gospel, scripture, church, pope, court of final appeal; res judicata [Lat.], ultimatum positiveness; dogmatism, dogmatist, dogmatizer; doctrinaire, bigot, opinionist†, Sir Oracle; ipse dixit [Lat.]. fact; positive fact, matter of fact; fait accompli [Fr.]. V. be certain &c adj.; stand to reason. render certain &c adj.; insure, ensure, assure; clinch, make sure; determine, decide, set at rest, make assurance double sure [Macbeth]; know &c (believe) 484. dogmatize, lay down the law. Adj. certain, sure, assured &c v.; solid, well-founded. unqualified, absolute, positive, determinate, definite, clear, unequivocal, categorical, unmistakable, decisive, decided, ascertained. inevitable, unavoidable, avoidless†; ineluctable. unerring, infallible; unchangeable &c 150; to be depended on, trustworthy, reliable, bound. unimpeachable, undeniable, unquestionable; indisputable, incontestable, incontrovertible, indubitable; irrefutable &c (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. Adv. certainly &c adj.; for certain, certes [Lat.], sure, no doubt, doubtless, and no mistake, flagrante delicto [Lat.], sure enough, to be sure, of course, as a matter of course, a coup sur, to a certainty; in truth &c (truly) 494; at any rate, at all events; without fail; coute que coute [Fr.], coute qu'il coute [Fr.]; 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. Phr. cela va sans dire [Fr.]; there is no question, no question, not a shadow of doubt, there is not a shadow of doubt; the die is cast &c (necessity) 601; facts are stubborn things [Smollett].