What is another word for most impermeable?

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Contexts Superlative for not allowing passage, typically fluid or gas Superlative for impossible to penetrate or pass through Superlative for consisting of matter all through Adjective ▲ Superlative for not allowing passage, typically fluid or gas tightest soundest firmest strongest toughest sturdiest hardiest hardest most watertight most waterproof most airtight most resistant most hermetic most rainproof most water-resistant most water-repellent most leak-proof most impervious most weatherproof most showerproof most impregnable most proof most fixed most wrapped most imperviable most leakproof most waterproofed most repellent most blocked most stormproof most galeproof most windproof most weathertight most protected most immune most resilient most enclosed most fireproof most bombproof most childproof most soundproof most bulletproof “The precipitate clogs the openings, eventually forming an impermeable seal.” Adjective ▲ Superlative for impossible to penetrate or pass through most impervious most impregnable most impassable most imperviable most impassible most inviolable most unnavigable most blocked most inaccessible most untraversable most unsurpassable most insurmountable most unyielding most unbreakable most choked most trackless most pathless most gridlocked “The Court has constructed an impermeable wall of separation between church and state.” Adjective ▲ Superlative for consisting of matter all through firmest hardest rigidest stiffest robustest stoutest sturdiest toughest huskiest steeliest tautest ruggedest strongest closest thickest densest tightest heaviest stoniest shortest rockiest jungliest fullest deepest securest closest-knit most solid most adamantine most hardened most unmalleable most unyielding most fixed most blocked most inflexible most concentrated most resolute most unrelenting most compact most dimensional most rigorous most compacted most impliable most rocklike most unwavering most concrete most congealed most impervious most frozen most jellied most set most uncompromising most rock-hard most compressed most condensed most crowded most packed most serried most jam-packed most substantial most inelastic most squashed most appressed most pressed most resistant most walkable most unbreakable most durable most unpliable most cramped most thickset most indurate most overgrown most impregnable most impassable most crushed most renitent most rock-like most particular most restricted most fine-grained most refractory Find more words! 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Use our Synonym Finder Nearby Words most impermissible most impersonal most impertinent most impertinently most imperturbable most imperturbably most impermanently most imperishably most imperiously most imperialistic most imperialist most imperial