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[uhn-fey-ling] /ʌnˈfeɪ lɪŋ/
not failing; not giving way; not falling short of expectation; completely dependable:
an unfailing friend.
inexhaustible; endless:
unfailing resources; unfailing good humor.
Origin of unfailing
1350-1400; Middle English; see un-1, failing
Related forms
unfailingly, adverb
unfailingness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unfailing
Contemporary Examples
Historical Examples
  • I owe more than I can say to their unfailing interest and readiness to discuss, to help and to criticise.

  • It was your unfailing resolve to help, which has brought us here.

    It Happened in Egypt C. N. Williamson
  • Here was a quack doctor selling his infallible specifics from his cart, promising an unfailing cure for all manner of diseases.

    John Deane of Nottingham W.H.G. Kingston
  • The men presided over everything with unfailing good-humour.

    Howards End E. M. Forster
  • In his unfailing optimism he translated Stacy's laugh as embarrassment and Demorest's as only ignorance of the real question.

    The Three Partners Bret Harte
British Dictionary definitions for unfailing


not failing; unflagging
continuous or unceasing
sure; certain
Derived Forms
unfailingly, adverb
unfailingness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unfailing

late 14c., "never coming to an end, unceasing," from un- (1) "not" + gerundive of fail (v.). Related: Unfailingly.

Online Etymology Dictionary, © 2010 Douglas Harper
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