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

Examples of unfailing in a Sentence

She is known for her unfailing optimism.

an unfailing judge of personal character

Recent Examples on the Web

But the matchup came down to Tim Walz’s record in Minnesota versus his opponent’s unfailing defense of Donald Trump. —Rebecca Mead, The New Yorker, 2 Oct. 2024

He was respected for his unfailing professionalism on the set of Glee. —Vic Verbalaitis, Peoplemag, 13 July 2024

If your style is more corporate than casual, silk and polka dots are an unfailing mix. —Alyssa Grabinski, Peoplemag, 3 Apr. 2024

In addition to writing about God’s unfailing love, Guthrie also addresses the tough questions that people of faith may grapple with: Why would an all-powerful God allow suffering? —Erin Jensen, USA TODAY, 20 Feb. 2024

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