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impregnable

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The definition of impregnable is something that cannot be destroyed or entered by force.

(adjective)

A fort that has been very well secured and that cannot be broken into is an example of something that would be described as impregnable.

See impregnable in Webster's New World College Dictionary

adjective

not capable of being captured or entered by force
unshakable; unyielding; firm: an impregnable belief

Origin: ME imprenable < OFr: see in- & pregnable

Related Forms:

impregnability noun
impregnably adverb

adjective

that can be impregnated

Origin: impregnate + -able

See impregnable in American Heritage Dictionary 4

adjective

Impossible to capture or enter by force: an impregnable fortress.
Difficult or impossible to attack, challenge, or refute with success: an impregnable argument.

Origin:

Origin: Middle English imprenable

Origin: , from Old French

Origin: : in-, not (from Latin in-; see in-¹)

Origin: + prenable, pregnauble, pregnable; see pregnable

Related Forms:

im·pregˈna·bly adverb

adjective

Capable of being impregnated.

Origin:

Origin: impregn(ate)

Origin: + -able

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