The difference between Defeatable and Impregnable
When used as adjectives, defeatable means capable of being defeated, whereas impregnable means too strong to be penetrated.
check bellow for the other definitions of Defeatable and Impregnable
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Defeatable as an adjective (rare):
Capable of being defeated.
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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.