/ Dictionary / Index U unfailing: Meaning and Definition of Find definitions for: un•fail•ing Pronunciation: (un-fā'ling), [key] — adj. not failing; not giving way; not falling short of expectation; completely dependable: an unfailing friend. inexhaustible; endless: unfailing resources; unfailing good humor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unfailing (Thesaurus) unfact unfair Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language