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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 physically puncture or rupture
“Her skin glistened in an impenetrable diamond layer, the creation of Gaia's geology and biology.”
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
Preventing the passage of fluids, gasses, or other organic matter
“Several drops can create an impenetrable seal around a shaft while still minimizing friction.”
Adjective
Having a very hard, solid or dense surface or structure
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“The house on Corso Magenta was gated and grilled, the walls several meters thick, the roof a solid and impenetrable structure of slate.”
Adjective
Made up of trees or vegetation packed closely or densely together
“On three sides spreads for miles an open country, but on the fourth is an impenetrable forest, through which Mr. Stanley and his followers in vain endeavored to force their way.”
Adjective
Invulnerable, impossible to attack
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“By following in Crusoe's footsteps, nineteenth-century boys believed the challenges of claiming their plot of land and transforming it into an impenetrable fortress would manifest their inherent talents and heroic qualities.”
Adjective
Having restricted access (to a particular person or group)
“Opponents of the Junto regularly accused these peers of acting as an impenetrable clique.”
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
Visually cloudy, difficult or impossible to see through
Adjective
Able to withstand
Adjective
Soundproof
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
Having no sympathy, feeling, or compassion
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Adjective
Incapable of being divided
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Adjective
Not clearly visible or attracting attention
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Adjective
(lost to) Hardened beyond sensibility or recovery
Adjective
Not explainable by physical laws
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