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Definition of unfailing:

  1. Not failing; not liable to fail; inexhaustible; certain; sure.


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.

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