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Definitions

unfailing

[uhn-fey-ling] / ʌnˈfeɪ lɪŋ /
ADJECTIVE
certain, unchanging
Synonyms
STRONGEST
bottomless boundless eternal inexhaustible steadfast unflagging
WEAK
absolute assiduous ceaseless come-through consistent constant continual continuing continuous counted-on delivering dependable diligent dyed-in-the-wool endless faithful infallible invariable loyal never-failing persistent reliable rock solid same solid staunch straight sure surefire there tried-and-true true trustworthy unlimited unrelenting
Antonyms
STRONGEST
changing limited
WEAK
failing impermanent uncertain unsure

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“The Ten Year Affair” handles these twists with unfailing intelligence, capturing the sincere but confusingly improvised mores of marriage today.

From The Wall Street Journal • Oct. 31, 2025

It was clear he had a brilliant, creative mind, a kind spirit, and an unfailing belief in himself and his projects.

From Los Angeles Times • Jul. 25, 2025

A major contributor to the 7M cult’s perceived creepiness is the dancers' unfailing polish and flat if gleaming expressiveness.

From Salon • Jun. 6, 2024

"Our gratitude is unfailing, and our admiration eternal," he ended, to a round of applause.

From BBC • Jun. 6, 2024

But there was an invisible ingredient that made the cure unfailing.

From "The Witch of Blackbird Pond" by Elizabeth George Speare