Definition of unfailing:
perpetual, indefatigable, incessant, persistent, infallible, perennial, everlasting, undying, eternal, ceaseless, continue, untiring, eonian, deathless, changeless, change, unceasing, constant, continual, without end, uninterrupted, invariable, consistent, ever-living, certain, unchanging, ceaseless, sure-fire, continual, endless, interminable, foolproof, relentless, continuous, unwearied, secure, certain, weariless, around-the-clock, round-the-clock, imperishable, nonstop, unremitting, unending, never-failing, absolute, timeless, unwearying, fadeless, immortal, sure, tireless, tired, same, unflagging, inexhaustible, never-ending, unfading, unerring, ongoing.
- "Looking Seaward Again", Walter Runciman.
- "Cavour", Countess Evelyn Martinengo-Cesaresco.
As to Vallombreuse, he had entirely changed and amended his way of life, and seemed to find unfailing pleasure and satisfaction, as well as benefit, in the companionship of his new friend and brother, to whom he was devoted, and who fully reciprocated his warm affection; while the prince, his father, joyfully dwelt in the bosom of his reunited family, and found in it the happiness he had vainly sought before.- "Captain Fracasse", Theophile Gautier.