Definition for Infallible:

• in-fal'i-bl, adj. incapable of error: trustworthy: certain.-- ns. INFALL'IBILISM; INFALL'IBILIST; INFALLIBIL'ITY.-- adv. INFALL'IBLY.-- THE DOCTRINE OF INFALLIBILITY in the R.C. Church, since 1870, is that the Pope, when speaking ex cathedrâ, is kept from error in all that regards faith and morals.

Synonyms for Infallible:

• adj.

  •absolute (adjective)
  • positive.
  •certain (adjective)
  • inarguable,
  • incontestable,
  • unassailable,
  • undisputable,
  • absolute.
  •sure-fire (adjective)
  • sure-fire,
  • surefire.
  •unerring (adjective)
  • unerring,
  • inerrable.
  •unerring, dependable (adjective)
  • faultless,
  • incontrovertible,
  • accurate,
  • effective,
  • certain,
  • acceptable,
  • handy,
  • surefire,
  • positive,
  • efficient,
  • unimpeachable,
  • flawless,
  • exact,
  • useful,
  • inerrant,
  • Undeceivable,
  • satisfying,
  • true,
  • unquestionable,
  • correct,
  • authoritative,
  • inerrable,
  • sure,
  • agreeable,
  • effectual,
  • foolproof,
  • unbeatable,
  • satisfactory,
  • efficacious,
  • apodictic,
  • trustworthy,
  • perfect,
  • impeccable,
  • helpful,
  • omniscient,
  • unfailing,
  • reliable.

• n.

  •
  • responsible,
  • reputable,
  • sound.
  •
  • ideally,
  • flawless,
  • certain,
  • sure-fire,
  • perfectly,
  • ideal,
  • secure,
  • sure,
  • impeccable,
  • model.
  •infallible (noun)
  • inerrable,
  • inerrant,
  • unerring,
  • unfailing,
  • foolproof.
  •unerring (noun)
  • dependable,
  • reliable,
  • true,
  • sure-fire,
  • authoritative,
  • unquestionable,
  • positive,
  • sure,
  • accurate,
  • incontrovertible,
  • apodictic,
  • exact,
  • perfect,
  • trustworthy,
  • faultless,
  • certain.

• Other synonyms:

  •
  • flawless,
  • ideally,
  • immaculate,
  • impeccable,
  • accurate.
  •
  • perfectly,
  • reliable.
  •
  • ideal.
  •
  • secure.
  •
  • model.
  •beyond doubt
  • certain.
  •dependable
  • sure-fire.
  •Other relevant words:
  • guaranteed,
  • certain,
  • influx,
  • assured,
  • microscopic,
  • satisfying,
  • admittedly,
  • religious,
  • inroad,
  • certainly,
  • credible,
  • confidence,
  • secure,
  • inarguable,
  • believable,
  • sure,
  • principled,
  • mathematical,
  • correct,
  • rigid,
  • detonate,
  • perfectly,
  • stable,
  • raid,
  • inevitable,
  • reputable,
  • effective,
  • oracular,
  • immaculate,
  • efficacious,
  • apodictic,
  • Undeceivable,
  • accurate,
  • alright,
  • obtrude,
  • surefire,
  • unbeatable,
  • necessary,
  • unadulterated,
  • faithful,
  • effectual,
  • ideally,
  • warranted,
  • Indefective,
  • responsible,
  • cocksure,
  • irreproachable,
  • descent,
  • trust,
  • foray,
  • ignite,
  • surety,
  • express,
  • nice,
  • interloper,
  • just right,
  • assault,
  • absolute,
  • irrupt,
  • definite,
  • authoritative,
  • bound,
  • trusty,
  • unblemished,
  • agreeable,
  • attack,
  • peerless,
  • intrusiveness,
  • certitude,
  • square,
  • honest,
  • useful,
  • fact,
  • strict,
  • certainty,
  • sure-fire,
  • security,
  • omniscient,
  • undoubted,
  • unquestionable,
  • impeccable,
  • Indefectible,
  • scientific,
  • honourable,
  • confident,
  • assuredly,
  • fine,
  • dependable,
  • perfect,
  • invade,
  • pure,
  • unflawed,
  • firm,
  • incontrovertible,
  • trusted,
  • acceptable,
  • reality,
  • unassailable,
  • chaste,
  • trustworthy,
  • trespasser,
  • ideal,
  • sureness,
  • true,
  • assurance,
  • intrude,
  • unmixed,
  • reliable,
  • safe,
  • helpful,
  • subtle,
  • burst,
  • uncontaminated,
  • stainless,
  • undeviating,
  • defectless,
  • erupt,
  • close,
  • model,
  • sinless,
  • unchangeable,
  • pinpoint,
  • rigorous,
  • intruder,
  • undisputable,
  • refined,
  • unspotted,
  • needful,
  • spotless,
  • conscientious,
  • tried and true,
  • direct,
  • doubtless,
  • faultless,
  • satisfactory,
  • constant,
  • requisite,
  • incontestable,
  • flawless,
  • explode,
  • predictable,
  • unimpeachable,
  • staunch,
  • incursion,
  • unavoidable,
  • precise,
  • unmistaken,
  • handy,
  • needed,
  • right,
  • undoubtedly,
  • delicate,
  • even,
  • errorless,
  • positive,
  • efficient,
  • severe,
  • conviction,
  • tried,
  • Taintless,
  • invasion,
  • untainted,
  • sound,
  • exact,
  • punctilious,
  • break.

Antonyms for Infallible:

• adj.

  • all
    fallible.
  • unerring, dependable
    fallible, faulty, imperfect, erring.
  • Other antonyms:
    flawed, faulty, defective, casual, unnecessary, needless, doubtful, uncertain, useless, questionable, imperfect, contingent, optional, worthless, weak.