INFALLIBLE Synonyms: 27 Similar and Opposite Words

infallible

adjective

(ˌ)in-ˈfa-lə-bəl

Definition of infallible

as in unerring

not being or likely to be wrong a teacher with an infallible memory for names

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in reliable

not likely to fail an infallible cure for hiccups

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of infallible Not that the Coastal Commission has been infallible over the years. — Steve Lopez, Los Angeles Times, 11 July 2026 Both experts acknowledged that the tests are not infallible, can’t determine exactly when DNA was left on an item, and can't confirm the source of DNA with absolute certainty. — N'dea Yancey-Bragg, USA Today, 10 July 2026 The government’s data are far from infallible (and, as history has shown, can be manipulated). — Will Gottsegen, The Atlantic, 9 July 2026 Corporate governance solutions rarely come in the form of universal, infallible prescriptions. — Jeffrey Sonnenfeld, Fortune, 6 July 2026 See All Example Sentences for infallible

Recent Examples of Synonyms for infallible

Adjective

Dean has an unerring sense about how to let her voice glide to the cumulus layer and back again, without remotely ever going over the top.

— Chris Willman, Variety, 17 July 2026
While there is undeniable star power, and an unerring ability to get the job done, England will have opportunities to make a mark of their own.

— Stuart James, New York Times, 12 July 2026

Definition of unerring

Adjective

His contact balance, patience, one-cut burst and reliable hands are quite appealing.

— Brad Evans, New York Times, 20 Aug. 2026
As an alternative to Starlink, the Ukrainians have rushed to develop reliable drones equipped with AI, which offer a way to get around Russia’s counter-drone defenses.

— Simon Shuster, The Atlantic, 20 Aug. 2026

Definition of reliable

Adjective

Everything is infused with melancholy, the unfailing indicator of the fundamental rift between humans and their natural environment.

— Literary Hub, Literary Hub, 11 Aug. 2026
Their reach was owed not just to the nine-member unit’s technical excellence and versatility but also their endless supply of positivity, of psychedelic Black power characterized by its leader’s unfailing belief in a beautiful tomorrow.

— Craig Jenkins, Vulture, 9 June 2026

Definition of unfailing

Browse Nearby Words

infallibility

infallible

infallibly

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Cite this Entry

Style

“Infallible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infallible. Accessed 26 Aug. 2026.

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Synonyms of infallible

adjective

Example Sentences

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