Definition of unfailing adjective from the Oxford Advanced American Dictionary

     

    unfailing

     adjective
    adjective
    NAmE//ʌnˈfeɪlɪŋ//
     
     
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  1. 1that you can rely on to always be there and always be the same synonym unerring
  2. 2 unfailing support She fought the disease with unfailing good humor.
unfailingly
 
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adverb unfailingly loyal/polite His job was to cook the meals, which he did unfailingly, every day.
See the Oxford Advanced Learner's Dictionary entry: unfailing