impregnable Definition in the Cambridge English Dictionary
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Definition of “impregnable” - English Dictionary

Definition of "impregnable" - American English Dictionary

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impregnableadjective

 us   /ɪmˈpreɡ·nə·bəl/
so ​strongly made that it cannot be ​broken into or taken by ​force: an impregnable ​fortress
(Definition of impregnable from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "impregnable" - British English Dictionary

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impregnableadjective

uk   us   /ɪmˈpreɡ.nə.bl̩/
A ​building or other ​place that is impregnable is so ​stronglybuilt and/or ​defended that it cannot be ​entered by ​force: Despite ​burglaralarms and ​windowlocks, ​homes are never impregnable against ​determinedthieves. mainly UK powerful and ​impossible to ​beat, ​especially in ​sport: Surrey have been ​building up an impregnable lead in this season's County Championship.
(Definition of impregnable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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