un·fail·ing

[uhn-fey-ling]
adjective
1.
not failing; not giving way; not falling short of expectation; completely dependable: an unfailing friend.
2.
inexhaustible; endless: unfailing resources; unfailing good humor.

Origin:
1350–1400; Middle English; see un-1, failing

un·fail·ing·ly, adverb
un·fail·ing·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
unfailing (ʌnˈfeɪlɪŋ) [Click for IPA pronunciation guide]
 
adj
1.  not failing; unflagging
2.  continuous or unceasing
3.  sure; certain
 
un'failingly
 
adv
 
un'failingness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Unfailing is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

unfailing
1382, "never coming to an end, unceasing," from un- (1) "not" + gerundive of fail.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They have borne the burden of a difficult and sensitive task with unfailing
  diligence and patience.
And you've done it with unfailing grace, intelligence, and courage.
Unfailing ambitions aside, nuclear power will decline, slowly.
All of us were impressed with their professionalism, expertise and unfailing
  patience.
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