unfailable

un·fail·able
U1N1F4A1I1L1A1B3L1E1
US, UK/ˌʌnˈfeɪləbl̩/

adjective

Impossible to fail.

“an unfailable test”

Scrabble 15
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Meanings

adjectiveunfailable (comparative more unfailable, superlative most unfailable)

comparative more unfailable · superlative most unfailable

  1. Impossible to fail.

    an unfailable test

  2. obsoleteInfallible.

    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)

Origin

From un- + fail + -able.

Full word history & related roots →
Cite this entry
APA

unfailable. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/unfailable

MLA

“unfailable.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/unfailable. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “unfailable,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/unfailable.

Source: unfailable on Wiktionary, CC BY-SA 4.0.