The difference between Impenetrable and Undefeatable
When used as adjectives, impenetrable means not penetrable, whereas undefeatable means not defeatable.
Undefeatable is also noun with the meaning: something that has an undefeatable quality.
check bellow for the other definitions of Impenetrable and Undefeatable
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Impenetrable as an adjective:
Not penetrable.
Examples:
"The fortress is impenetrable, so it cannot be taken."
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Impenetrable as an adjective (figuratively):
Incomprehensible; fathomless; inscrutable.
Examples:
"Business jargon makes this document impenetrable, I can't understand it."
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Impenetrable as an adjective:
Opaque; obscure; not translucent or transparent.
Examples:
"When night falls, she cloaks the world in impenetrable darkness."
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Undefeatable as an adjective:
Not defeatable; impossible to defeat.
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Undefeatable as a noun:
Something that has an undefeatable quality.