Definition of “impregnable” - English Dictionary

british dictionary

“impregnable” in British English

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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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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)