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IMPENETRABLE : unable to be penetrated or breached, impassable, impervious Example : "The concrete dam was an impenetrable obstacle for the fish." The word is used metaphorically for apparently unbeatable blockages or impediments. A book or written form may be "impenetrable" when it cannot be directly understood, or a determined bloc of voters may present an "impenetrable" opposition to an attempt to pass a law.

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16y ago

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