The difference between Impregnable and Pregnable
When used as adjectives, impregnable means too strong to be penetrated, whereas pregnable means vulnerable to attack.
check bellow for the other definitions of Impregnable and Pregnable
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Impregnable as an adjective (of a fortress, wall, etc., also used figuratively):
Too strong to be penetrated.
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Impregnable as an adjective:
Capable of being impregnated.
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Pregnable as an adjective:
vulnerable to attack