infallible

• POS: Adjective, Noun
• HYPHEN: in=fal=li=ble

CIDE DICTIONARY

infallible, a. [Pref. in- not + fallible: cf. F. infallible.].

•  Not fallible; not capable of erring; entirely exempt from liability to mistake; unerring; inerrable.  Dryden.  [1913 Webster]
•  Not liable to fail, deceive, or disappoint; indubitable; sure; certain; as, infallible evidence; infallible success; an infallible remedy.  [1913 Webster]

  "To whom also he showed himself alive, after his passion, by many infallible proofs."  [1913 Webster]
•  Incapable of error in defining doctrines touching faith or morals. See Papal infallibility, under Infallibility.  [1913 Webster]

OXFORD DICTIONARY

infallible, adj.
1 incapable of error.
2 (of a method, test, proof, etc.) unfailing; sure to succeed.
3 RC Ch. (of the Pope) unable to err in pronouncing dogma as doctrinally defined.

Derivative

infallibility n. infallibly adv.

Etymology

ME f. F infaillible or LL infallibilis (as IN-(1), FALLIBLE)

THESAURUS

infallible

absolute, acceptable, agreeable, beyond all praise, certain, chaste, close, constant, correct, defectless, delicate, dependable, direct, effective, efficacious, efficient, even, exact, express, faithful, faultless, fine, flawless, foolproof, handy, helpful, ideal, immaculate, impeccable, indefectible, indefective, inerrable, inerrant, irreproachable, just right, mathematical, micrometrically precise, microscopic, nice, oracular, peerless, perfect, pinpoint, precise, pure, refined, reliable, religious, religiously exact, rigid, rigorous, satisfactory, satisfying, scientific, scientifically exact, secure, severe, sinless, spotless, square, stainless, strict, subtle, sure, surefire, taintless, unadulterated, unblemished, uncontaminated, undeceivable, undeviating, unerring, unfailing, unfaultable, unmistaken, unmixed, unspotted, untainted, useful

ROGET THESAURUS

infallible

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.