5 English Synonyms for IMPENETRABLE

Definition: 1. Capable of being impregnated; impregnatable.

There are 3 definitions of the word impregnable

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Definition: 1. Impossible to fathom or understand.

There are 2 definitions of the word unfathomable

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Definition: 1. Firm against attack; fortified by nature or art; impregnable; strong.

There are 27 definitions of the word fast

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Definition: 1. Not defeatable; impossible to defeat.

There are 2 definitions of the word undefeatable

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Definition: 1. (archaic) Synonym of impenetrable

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