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 Bash, Tapper, CNN and many others treated Fauci as an infallible god. — Ian Miller Outkick, FOXNews.com, 3 Aug. 2026 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 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

The pass the Netherlands forward wrapped into Alexander Isak’s feet was perfect.

— Stuart James, New York Times, 8 Sep. 2026
The Hoosiers have won 17 straight games, the longest active winning streak in the Football Bowl Subdivision, and are a perfect 16-0 at home under Cignetti.

— Arkansas Online, Arkansas Online, 8 Sep. 2026

Definition of perfect

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

Adjective

The operators who succeed in the years ahead will be those who understand that being a good actor is not about being flawless.

— Jeff Cook, New York Daily News, 15 Sep. 2026
Walker is one of many performers who has to blend specialty skills with traditional acting to form one flawless company.

— Jenelle Riley, Los Angeles Times, 14 Sep. 2026

Definition of flawless

Browse Nearby Words

infallibility

infallible

infallibly

See all Nearby Words

Cite this Entry

Style

“Infallible.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infallible. Accessed 19 Sep. 2026.

Copy Citation

Synonyms of infallible

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

aggrandize

Popular in Grammar & Usage

Why do we use apostrophes to show possession?

Merriam-Webster’s Great Big List of Words You Love to Hate

The Exceptions of '-s' and '-es' Plurals

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Popular in Wordplay

9 Words That Sound Like Insults But Aren't

Back to School Vocabulary

Words from the 'Odyssey'

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Sept. 18

Popular

Why do we use apostrophes to show possession?

9 Words That Sound Like Insults But Aren't

Back to School Vocabulary

Games & Quizzes