Impregnable Definition

ĭm-prĕgnə-bəl

adjective

Not capable of being captured or entered by force.

Webster's New World

Difficult or impossible to attack, challenge, or refute with success.

An impregnable argument.

American Heritage

Unshakable; unyielding; firm.

An impregnable belief.

Webster's New World

That can be impregnated.

Webster's New World

(of a fortress, wall, etc., also used figuratively) Too strong to be penetrated.

Wiktionary

Synonyms:

Origin of Impregnable

From Middle French imprenable, im- (“not”), + prendre (“to take”) +-able (“able to be the object of an action”). Intrusive g added 16c on model of deign, reign.

From Wiktionary
Middle English imprenable from Old French in- not (from Latin in- in–¹) prenable, pregnauble pregnable pregnable

From American Heritage Dictionary of the English Language, 5th Edition
From impregnate +‎ -able, ultimately from Latin impraegnatus (“made pregnant”).

From Wiktionary
impregn(ate) –able

From American Heritage Dictionary of the English Language, 5th Edition

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