unfailing

adjective

un·​fail·​ing ˌən-ˈfā-liŋ 

: 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

unfailingly

ˌən-ˈfā-liŋ-lē 

adverb

Synonyms

• infallible
• unerring

Example Sentences

She is known for her unfailing optimism.

an unfailing judge of personal character

Recent Examples on the Web

From the slinky R&B of Dangerously in Love to the confessional lyricism of Lemonade, Beyoncé’s solo career is characterized by bold artistic swings and an unfailing sense of style. —Keaton Bell, Vogue, 4 Sep. 2021

Hong and Dalene rode just at the edge of restraint, sustaining a neoclassical elegance through precise and detailed rhythmic unisons, and, in the violin, a silken tone and unfailing intonation. —Luke Schulze, San Diego Union-Tribune, 1 Feb. 2023

The brakes, cooled by strange fan-blade wheels that make the low-profile seventeen-inch tires look like whitewalls, display perfect feel and unfailing power. —Arthur St. Antoine, Car and Driver, 15 Dec. 2022

And the Tiro, with an unfailing style and functionalities like moisture-absorbing and zippered ankles, is perfect for any sporty occasion. —Maverick Li, Men's Health, 12 Jan. 2023

It’s this unfailing authenticity that has not only led to her building an empire, but earning the trust of curious and concerned readers aiming to better their own financial futures. —Jasmine Browley, Essence, 14 Dec. 2022

Adapted by Bairéad — whose background is in television and documentaries — from Claire Keegan’s short story, Foster, this is a work of unfailing restraint, which makes its stealth emotional heft all the more remarkable. —David Rooney, The Hollywood Reporter, 24 Oct. 2022

Multiple forms of climate leadership, leveraging each other, are needed to get the job done — as long as the work is guided by science, a commitment to equity and justice, and an unfailing moral compass. —CNN, 20 Oct. 2022

So many books of short fiction are, understandably, hit or miss; Jones here is unfailing. —Molly Mcardle, Men's Health, 3 Oct. 2022

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Word History

First Known Use

14th century, in the meaning defined above

Kids Definition

unfailing

adjective

un·​fail·​ing ˌən-ˈfā-liŋ 

ˈən-

1

: not likely to fail : constant, unflagging

unfailing support

2

: not likely to run out or be used up : everlasting, inexhaustible

an unfailing supply

3

: infallible sense 2

the unfailing mark of an amateur

unfailingly adverb