Word.ws English Dictionary

unfailable

Syllables: un·fail·ableUK/ˌʌnˈfeɪləbl̩/

unfailable adjective: impossible to fail.

Adjective

unfailable (comparative more unfailable, superlative most unfailable)

  1. Impossible to fail.
    • an unfailable test
  2. (obsolete) Infallible.
    • If then we believe this unfailable word of truth, who would not be content to mourn awhile, that he may rejoice for ever?c. 1652, Joseph Hall, The Mourner in Sion (sermon)

Forms of unfailable

comparativemore unfailable
superlativemost unfailable

Origin of unfailable

From un- + fail + -able.

Questions about unfailable

What does unfailable mean?
Unfailable means impossible to fail.
What part of speech is unfailable?
Unfailable is an adjective.
How do you pronounce unfailable?
Unfailable is pronounced /ˌʌnˈfeɪləbl̩/ (UK).

Words near unfailable in the dictionary

  1. unfading
  2. unfadingly
  3. unfadingness
  4. unfagged
  5. unfail
  6. unfailable
  7. unfailably
  8. unfailed
  9. unfailing
  10. unfailingly
  11. unfailingness

Source and license

Adapted from Wiktionary: unfailable (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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