Unassailable

//ˌʌnəˈseɪləbl̩// adj, noun

adj, noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    Something, such as a belief, that cannot be assailed.
Adjective
  1. 1
    Secure against attack; impregnable.

    "Yet in the number, I do know but One That vnaſſayleable holds on his Ranke, Vnfhak’d of Motion : and that I am he, Let me a little ſhew it, euen in this : That I was conſtant Cymber ſhould be baniſh’d, And conſtant do remaine to keepe him ſo."

  2. 2
    Undeniable, incontestable or incontrovertible. broadly

    "She won the debate with her unassailable logic."

Adjective
  1. 1
    without flaws or loopholes wordnet
  2. 2
    impossible to assail wordnet
  3. 3
    immune to attack; incapable of being tampered with wordnet

Synonyms

All synonyms
incontestableinviolablebulletproofflawlessimpenetrableimpregnable

Example

More examples

"The mountain seemed unassailable."

Etymology

From un- + assailable.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.