Try Our Apps


Supposedly vs. Supposably


[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.
Cite This Source
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
Cite This Source
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
Cite This Source

Word of the Day

Difficulty index for unfailing

Some English speakers likely know this word

Word Value for unfailing

Scrabble Words With Friends

Nearby words for unfailing