Usually means: Cannot fail under any circumstances.
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We found 9 dictionaries that define the word unfailable:

General (9 matching dictionaries)
  1. unfailable: Wiktionary
  2. Unfailable: Dictionary.com
  3. Unfailable: Online Plain Text English Dictionary
  4. unfailable: Webster's Revised Unabridged, 1913 Edition
  5. Unfailable: AllWords.com Multi-Lingual Dictionary
  6. unfailable: Webster's 1828 Dictionary
  7. unfailable: FreeDictionary.org
  8. Unfailable: TheFreeDictionary.com
  9. unfailable: Wordnik

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Definitions from Wiktionary (unfailable)

▸ adjective:  (obsolete) infallible
▸ adjective:  Impossible to fail

Similar:
unfailing, unfallible, infallible, noninfallible, nonfallible, indefiable, unshakable, incontradictable, undefeasible, uncontradictable, more...

Opposite:
infallible, perfect, flawless, impeccable



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Similar:
unfailing, unfallible, infallible, noninfallible, nonfallible, indefiable, unshakable, incontradictable, undefeasible, uncontradictable, more...

Opposite:
infallible, perfect, flawless, impeccable



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