1
as in dense
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
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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Have a Veggie and Bean Breakfast Hash Mixing potatoes, bell pepper, spinach, zucchini, mushrooms, and black beans into a fiber-rich breakfast hash is a colorful and nutrient-dense way to start your day.—
Morgan Pearson,
Verywell Health,
21 Oct. 2025
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The confounding discovery of a human femur has created a mystery in the dense woods of rural North Carolina.—
Mark Price,
Charlotte Observer,
21 Oct. 2025
Adjective
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Brewers pitcher Jacob Misiorowski’s excellent performance from the mound – striking out nine, a Milwaukee rookie postseason record – ensured that Thursday’s game was a tight affair through five innings, but LA took the lead in the sixth on Tommy Edman’s RBI single.—
George Ramsay,
CNN Money,
17 Oct. 2025
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Thibodeau was known for utilizing a tight rotation and playing his guys for extended minutes.—
Stan Son,
New York Times,
17 Oct. 2025
Adjective
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But that doesn't mean Davis is impervious to economic headwinds.—
Laura Hackett,
NPR,
26 Sep. 2025
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Broder was a rare figure that was impervious to the notorious agency wars, commanding respect across agency lines.—
Nellie Andreeva,
Deadline,
24 Sep. 2025
Adjective
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Their style of pitching — relentlessly pound the strike zone — works well in a ballpark where the thick air depresses doubles and triples.—
Tyler Kepner,
New York Times,
16 Oct. 2025
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Let cool and spread a layer, about one-fourth-inch thick, of cream cheese icing over the entire cake.—
Kathryn Gregory,
Louisville Courier Journal,
15 Oct. 2025
Adjective
-
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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Each loop of the driveway produced an impassable snowdrift in winter, but by then Carol and Mike were on the coast, watching waving kelp fronds from their living room.—
Literary Hub,
Literary Hub,
17 Oct. 2025
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If enough satellites are in orbit, this debris could set off a chain reaction, rendering the environment around Earth practically impassable.—
Big Think,
Big Think,
15 Oct. 2025
Adjective
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Royal expert and author Christopher Andersen said Princess Anne, who has been a close confidant and advisor to her brother Charles for a while, was likely involved in the decision.—
Lizzie Lanuza,
StyleCaster,
21 Oct. 2025
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Let’s take a closer look at the best mowing height and timing to prepare your lawn for the cold ahead.—
Mary Marlowe Leverette,
Southern Living,
21 Oct. 2025
Adjective
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Any question which of those teams has a stout and sturdy offensive line?—
Mirjam Swanson,
Oc Register,
20 Oct. 2025
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If possible, drive to a nearby sturdy building.—
NC Weather Bot,
Charlotte Observer,
20 Oct. 2025
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 22 Oct. 2025.
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