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Definition of impenetrable

impenetrable

/ɪmˈpɛn.ɪ.tɹə.bəl/
im · pen · e · tra · ble
Adverb:impenetrably
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impenetrable Lexical Profile

impenetrable Game Scores & Validity

• adjective

1

Impossible to pass through, enter, or pierce physically.

Example

"The explorers struggled to find a path through the impenetrable jungle canopy."

2

Impossible to understand, fathom, or interpret.

Example

"The ancient manuscript was written in an impenetrable dialect that baffled linguists for decades."

Synonyms
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Antonyms
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• Rhymes for impenetrable

• Nearby Words

impel
impeller
impending
impenetrable
imperative
imperatively
imperceivable

Word Origin & Etymology

Borrowed in the late 15th century from Middle French or directly from Latin impenetrabilis ('that cannot be pierced'), formed from in- ('not') and penetrabilis ('piercing, penetrable').

Cite this Entry

Wordmom. (2026). Definition of Impenetrable. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/impenetrable
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