unfailing
UK: ʌnˈfeɪlɪŋ | US: ʌnˈfeɪlɪŋ
adj. 1. reliable or constant; never weakening or disappearing
adj. 2. inexhaustible; limitless in supply or endurance
The word "unfailing" combines the Old English prefix "un-" (meaning "not") with the verb "fail," derived from Latin "fallere" (to deceive or disappoint). The suffix "-ing" turns it into an adjective, emphasizing permanence or reliability. Historically, "fail" originally implied stumbling or falling short, but by the 13th century, it evolved to mean "lack of success." Adding "un-" inverted this to signify steadfastness, reflecting a linguistic shift from absence (failure) to assured presence (unfailing).
Her unfailing optimism inspired everyone during tough times.
The desert sun was an unfailing source of heat.
He showed unfailing loyalty to his friends.
The old clock kept unfailing time for decades.
Their unfailing support helped her achieve her dreams.