1
as in impervious
impossible to get through or into
the wall of security people surrounding the rock band was impermeable
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Antonyms & Near Antonyms
2
as in tight
not allowing penetration (as by gas, liquid, or light)
an impermeable seal on the ancient tomb had preserved the artifacts exceptionally well
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Example Sentences
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Recent Examples of impermeable
Which means the bigger the economy, the greater the means to erect an impermeable national defense system.
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John Tamny, Forbes.com, 12 Sep. 2025
But simply piling mounds of topsoil on top of hard clay ground can result in an impermeable layer, both to water and roots.
—Andy Wilcox, Better Homes & Gardens, 7 Aug. 2025
That aquifer is covered by impermeable layers of rock or clay, putting the water in it under high pressure in some locations.
—Claire Osborn, Austin American Statesman, 30 July 2025
The part of Texas that flooded last week is known as Flash Flood Alley because of its impermeable limestone hills and frequent downpours, but these floods were unusually severe for the area.
—Rebecca Hersher, NPR, 7 July 2025
See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
Adjective
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Trump, however, is impervious to legal restraints.—
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Rates for commercial and industrial properties will be increased based on impervious surface and square footage.—
Adjective
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Loveland caught eight passes for 137 yards for the Bears, who had closed the regular season with tight losses to San Francisco and Detroit.—
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As temperatures drop and humidity plummets, the skin’s natural moisture levels decline faster, fine lines look more pronounced, and that tight, uncomfortable feeling can become a near-daily occurrence.—
Adjective
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In extremely dense fog where visibility is near zero, the best course of action is to first turn on your hazard lights, then simply pull into a safe location such as a parking lot of a local business, and stop.—
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At 6-foot-3, 275 pounds, Bain’s measurables might not fit every team’s wish list but would work well in Kansas City, where defensive coordinator Steve Spagnuolo has preferred dense and powerful pass rushers.—
Adjective
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They’re made of a buttery soft, thick material that will keep you warm and cozy at home all winter.—
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Too thick of a mascara coat, and suddenly my gaze droops.—
Adjective
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Traffic concerns remained a prominent theme of the more than 100 emails the city received in early December, but many people expressed excitement at the prospect of a closer Costco.—
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The Clippers raced to a 14-5 lead, but the Knicks answered with eight straight points and the game was close for the first three quarters.—
Adjective
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Miami has rekindled memories of its 2001 national championship team behind a defense that went from porous to nearly impenetrable in its first season under coordinator Corey Hetherman.—
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Miami has rekindled memories of its 2001 national championship team behind a defense that went from porous to nearly impenetrable in its first season under coordinator Corey Hetherman.—
Adjective
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Soon the streets became impassable.—
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The Sierra Nevada mountains are also looking at 2 to 4 feet of snow, which would render many mountain passes impassible.—
Adjective
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But their quarterback issues could make those defenses look impregnable.—
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OpenAI wasn’t a fortress, wasn’t impregnable.—
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 12 Jan. 2026.
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