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

Indeed, there is convincing evidence of momentum in stock and other asset returns, but this is not an unfailing natural law. —Bill Stone, Forbes, 22 Nov. 2024

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

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