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English definition of “impregnable”

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impregnable

adjective uk   /ɪmˈpreɡ.nə.bl̩/ us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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