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English Lexicon

Impregnable

/ɪmˈprɛɡ.nə.bəl/
adjectiveCEFR C1 (Advanced)Top #8500 frequency
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Comprehensive Definitions & Senses

2 senses
As adjective
  1. 1

    Unable to be defeated, overthrown, or successfully attacked; extremely strong.

    "The medieval castle stood on a high cliff, making it an impregnable fortress against any invading army."
  2. 2

    Free from any possibility of being undermined, questioned, or refuted.

    "The scientist presented an impregnable defense of her climate change theory backed by decades of data."
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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Late Middle English word 'impregnable', stemming from Old French 'impregnable', based on the Latin prefix 'in-' (not) combined with 'praegnare' (to be pregnant, full). Over time, the meaning evolved from 'unable to become pregnant' to its modern figurative and literal sense of being unable to be captured, broken into, or overcome.

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