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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

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

Bryant also noted how her family had been an unfailing emotional support system.

From Los Angeles Times • Oct. 11, 2023

Jughead was a favourite because of his unfailing devotion to food.

From BBC • Sep. 23, 2023

My impulses were not filled with unfailing virtue.

From "Between the World and Me" by Ta-Nehisi Coates