Dictionary entryCEFR C2adjective

impregnable

IPA pronunciation: /ɪmˈpreɡ.nə.bəl/

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Russian meaning

Неприступный, неуязвимый

English definition

Unable to be captured or broken into; invulnerable.

Example

The mathematical proof appeared impregnable against peer critique.

Collocations

impregnable fortress
impregnable defense
impregnable logic

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