Definition of "impenetrably" [im•pen•e•tra•bly]

• In an impenetrable manner or state; imperviously. (adverb)

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• "I began a fumbling, stumbling study of flamenco and quickly discovered how dauntingly vast and impenetrably arcane the subject is."
• "The rules become pretty meaningless when influence can be exercised by impenetrably opaque offshore vehicles."
• "Saigon, a city in chaos 36 years ago, is a place that seems almost impenetrably Vietnamese but also wholly open to the world's new rhythms."