un·​fail·​ing | \ˌən-ˈfā-liŋ \

Definition of unfailing 

: not failing or liable to fail:

a : constant, unflagging unfailing courtesy

b : everlasting, inexhaustible a subject of unfailing interest

c : infallible, sure an unfailing test

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Other Words from unfailing

unfailingly \ˌən-​ˈfā-​liŋ-​lē \ adverb

Synonyms & Antonyms for unfailing


infallible, unerring



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Examples of unfailing in a Sentence

She is known for her unfailing optimism. an unfailing judge of personal character

Recent Examples on the Web

His unfailing positive attitude was an inspiration to all who knew him. courant.com, "Robert J. Wise," 5 July 2018 Every detail of my stay was organized by Journey Mexico—including all reservations and private VIP tours—with unfailing expertise and graciousness. Mary Kaye Schilling, Town & Country, "How to Plan a Trip to Mexico City," 18 Oct. 2016 His love of life, unfailing generosity, and warm heart will be missed by all who knew him. OrlandoSentinel.com, "Deaths in Central Florida: 5/19," 19 May 2018 Through it all, the two excellent leads meet the challenge with unfailing professionalism and determined smiles. Justin Chang, latimes.com, "Tessa Thompson and Melissa Leo team up in the wan, wobbly dramedy 'Furlough'," 15 Mar. 2018 His infectious laughter, unfailing generosity, and warm heart will be missed by all who knew him. OrlandoSentinel.com, "Deaths in Central Florida: 5/7," 7 May 2018 Their chemistry was distinctive, as was their unfailing ability to return to each other time and time again, making their shippers go nearly as crazy as the fans of the other Ross and Rachel (that’d be on Friends). Noor Brara, Vogue, "This Is How Suits Will Bid Farewell to Meghan Markle," 28 Mar. 2018 But the support from die-hard fans and the star's unfailing humor were true. Bryan Alexander, USA TODAY, "Burt Reynolds has regrets, but he's still standing and smiling as 'The Last Movie Star'," 25 Mar. 2018 Known for his gentlemanly ways and unfailing kindness, he was also known for his unusually good looks and warm friendliness. Sun-Sentinel.com, "Deaths in South Florida: 3/7," 7 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unfailing.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of unfailing

14th century, in the meaning defined above

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Statistics for unfailing

Last Updated

22 Nov 2018

Look-up Popularity

Time Traveler for unfailing

The first known use of unfailing was in the 14th century

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More Definitions for unfailing



English Language Learners Definition of unfailing

: never changing or becoming weaker even in difficult times

: always providing enough of what is needed


un·​fail·​ing | \ˌən-ˈfā-liŋ \

Kids Definition of unfailing

: not failing or likely to fail : constant unfailing support

Other Words from unfailing

unfailingly adverb He is unfailingly punctual.

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More from Merriam-Webster on unfailing

Rhyming Dictionary: Words that rhyme with unfailing

Thesaurus: All synonyms and antonyms for unfailing

Spanish Central: Translation of unfailing

Nglish: Translation of unfailing for Spanish Speakers

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a soft lustrous wool fabric with mohair

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