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Meaning of “impregnable” in the English Dictionary

"impregnable" in British English

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impregnableadjective

uk   /ɪmˈpreɡ.nə.bəl/  us   /ɪmˈpreɡ.nə.bəl/
A building or other place that is impregnable is so strongly built and/or defended that it cannot be entered by force: Despite burglar alarms and window locks, homes are never impregnable against determined thieves.
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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"impregnable" in American English

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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)
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