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unassailable
/ˌʌnəˈseɪləbl̩/
noun
Something, such as a belief, that cannot be assailed.
adjective
Secure against attack; impregnable.
(by extension) Undeniable, incontestable or incontrovertible.
"She won the debate with her unassailable logic."
Similar: incontestable, unopposable
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