What is another word for impenetrable?

Need synonyms for impenetrable? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Impossible to penetrate
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“The range forms an impenetrable barrier between Europe and Asia.”
Adjective
Unintelligible and not able to be understood
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“But as a technology columnist, I'm in the business of coming up with confusing and impenetrable reactions to events around me.”
Adjective
Impossible to pass through or enter
“But the circle of outraged nobles had made an almost impenetrable wall surrounding the king and the prince.”
Adjective
Exclusive or private
Adjective
Having a massive, unchanging structure that does not permit individual variation
Adjective
Silent
Adjective
Shielded or protected from attack or damage
Adjective
Dark and gloomy, especially due to thick mist
Adjective
Having no limits or boundaries in time, space, extent, or size
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Adjective
Callous and toughened by experience
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Adjective
Without sympathy, feeling or compassion
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Adjective
Incapable of being divided
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Adjective
Not explainable by physical laws
Adjective
Impressive and imposing in appearance or style, especially pretentiously so
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Adjective
Not clearly visible or attracting attention
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