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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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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Recent Examples of impermeable
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
The spongy material is mostly made of air, yet nearly impermeable to both air and liquid.
—Brandee Gruener, Southern Living, 7 May 2025
See All Example Sentences for impermeable
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
The spongy material is mostly made of air, yet nearly impermeable to both air and liquid.
—Brandee Gruener, Southern Living, 7 May 2025
See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
Adjective
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But there were strengths here, too, none more than England’s impervious Lazarus complex, that baffling inability to know when one is in a state of emergency.—
Megan Feringa,
New York Times,
26 Oct. 2025
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The assessment by PlanIT Geo also found that only 29% of Pittsburg’s land is suitable for new tree planting, due to impervious surfaces.—
Hema Sivanandam,
Mercury News,
19 Oct. 2025
Adjective
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There’s something rare about Swain, who is a young brainiac, but one who has built his business the old-fashioned, pre-quant-trading and Excel models Wall Street way, via charm offensives that weave webs of tight relationships few rivals can match.—
Shawn Tully,
Fortune,
1 Nov. 2025
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Money was tight, especially when Smith’s father, who worked as a machinist after returning from World War II, was on strike.—
Amy Weiss-Meyer,
The Atlantic,
31 Oct. 2025
Adjective
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Even at full sprint, the characters are moving at a relatively normal speed, with levels designed to be smaller, yet dense, to reduce the amount of backtracking and desperate ping-ponging all over the map.—
Christopher Cruz,
Rolling Stone,
4 Nov. 2025
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According to the Dietary Guidelines for Americans 2020-2025, a nutrient-dense diet is a healthy eating plan in which most of your nutritional needs are met by 85% of the calories consumed.—
Anna Giorgi,
Verywell Health,
4 Nov. 2025
Adjective
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At great risk, Hamida disguises herself as a khes (a thick cotton cloth) seller and enters the house to plan with Lajo an escape route.—
JSTOR Daily,
JSTOR Daily,
30 Oct. 2025
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The Oklahoma native's signature is his thick accent and his straight talk.—
Raechal Shewfelt,
Entertainment Weekly,
29 Oct. 2025
Adjective
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Trump levied his greatest assault against the international economic order, announcing the most expansive set of tariffs in American history on both autocratic adversaries and America’s closest democratic allies in April 2025 (Russia was strikingly excluded).—
Literary Hub,
Literary Hub,
5 Nov. 2025
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Trump, however, made inroads with New Jersey voters in November 2024, making for a surprisingly close race.—
Andrew Stanton,
MSNBC Newsweek,
5 Nov. 2025
Adjective
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Yes, only two additional albums in 30 years since his 1995 debut, with a 14-year gap between the second and third, but an impenetrable recipe for everyone from Beyoncé to Kendrick Lamar.—
Kevin Powell,
MSNBC Newsweek,
16 Oct. 2025
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For instance, in The Trial, Kafka looks at alienation vis-à-vis a faceless, impenetrable bureaucracy.—
Big Think,
Big Think,
14 Oct. 2025
Adjective
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On the Tibetan side of Everest, ticket sales had been suspended since Tuesday afternoon as roads turned icy and visibility plunged, creating impassable conditions for vehicular traffic, according to the tourism department of Tingri county.—
Reuters,
CNN Money,
29 Oct. 2025
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And because so many roads are impassable, damage assessment was only just beginning this evening after a devastating direct hit from Melissa.—
Matt Nighswander,
NBC news,
29 Oct. 2025
Adjective
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Resilience is the key The word ‘resilient’ used to mean impregnable and capable of withstanding all challenges.—
David Parker,
Forbes.com,
31 July 2025
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One of the grandest occasions in golf was in 1930, when the great Bobby Jones won the British Amateur at St. Andrews and then captured the claret jug at Royal Liverpool on his way to winning the Grand Slam of that era — the impregnable quadrilateral, as it was called.—
Doug Ferguson,
Chicago Tribune,
16 July 2025
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 5 Nov. 2025.
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