Etymology
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unfailing (adj.)

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

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Definitions of unfailing

unfailing (adj.)
not liable to failure;
the unfailing sign of an amateur
an unfailing test
Synonyms: foolproof
unfailing (adj.)
always able to supply more;
a subject of unfailing interest
an unfailing source of good stories
unfailing (adj.)
unceasing;
unfailing loyalty
unfailing good spirits
Synonyms: unflagging
From wordnet.princeton.edu