Roget's Thesaurus: Entry 474 (Certainty)

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#474. Certainty. -- N. certainty; necessity &c. 601; certitude, surety, assurance; dead certainty, moral certainty; infallibleness &c. adj.; infallibility, reliability; indubitableness, inevitableness, unquestionableness[obs].

gospel, scripture, church, pope, court of final appeal; res judicata[Lat], ultimatum positiveness; dogmatism, dogmatist, dogmatizer; doctrinaire, bigot, opinionist[obs], 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[obs]; 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[obs]; 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[obs], 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, - not a shadow of doubt; the die is cast &c. (necessity) 601; " facts are stubborn things " [Smollett].