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
The spongy material is mostly made of air, yet nearly impermeable to both air and liquid.
—
Brandee Gruener, Southern Living, 7 May 2025
Given the area’s especially hard, impermeable soil and the high cost of installing private wastewater systems, many residents have resorted to straight piping to deal with human wastewater.
—Curtis Bunn, NBC news, 1 May 2025
What if the girls all band together and reject me like an impermeable cellular membrane, keeping me out, unable to penetrate their circle of friendship?
—Michael Nied, People.com, 28 Apr. 2025
Achieving that often meant forgoing impermeable materials and permanent designs, which stands in stark contrast to the way modern-day water management works are constructed.
—Ari Caramanica, The Conversation, 8 Apr. 2025
See All Example Sentences for impermeable
Brandee Gruener, Southern Living, 7 May 2025
Given the area’s especially hard, impermeable soil and the high cost of installing private wastewater systems, many residents have resorted to straight piping to deal with human wastewater.
—Curtis Bunn, NBC news, 1 May 2025
What if the girls all band together and reject me like an impermeable cellular membrane, keeping me out, unable to penetrate their circle of friendship?
—Michael Nied, People.com, 28 Apr. 2025
Achieving that often meant forgoing impermeable materials and permanent designs, which stands in stark contrast to the way modern-day water management works are constructed.
—Ari Caramanica, The Conversation, 8 Apr. 2025
See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
Adjective
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This happens when its dense stellar corpse is close enough to its companion star to allow its gravity to begin stripping away the partner's stellar material.—
Robert Lea,
Space.com,
16 Sep. 2025
-
The resulting configuration provides much denser storage than conventional all flash parallel file systems.—
Thomas Coughlin,
Forbes.com,
16 Sep. 2025
Adjective
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Credit spreads are at their tightest in about 20 years, meaning there is little difference in yields between corporate bonds compared to government bonds.—
Sasha Rogelberg,
Fortune,
12 Sep. 2025
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The project, created under tight deadlines and with hobby-grade parts, is now on track for wider military use.—
Kapil Kajal,
Interesting Engineering,
12 Sep. 2025
Adjective
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Various groups develop impervious boundaries, neutralizing the effectiveness of people who have to interact across them.—
Carol Kinsey Goman,
Forbes.com,
25 Aug. 2025
-
Modern American popular culture contains many jocular characters that resemble this folkloric bird, who is delightfully impervious to pain, from cartoon characters such as the Road Runner – an actual bird – to the foulmouthed, self-regenerating antihero Deadpool.—
Perin Gürel,
The Conversation,
19 Aug. 2025
Adjective
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The paper demonstrates thick sodium cathodes that perform at room temperature and down to freezing.—
Aamir Khollam,
Interesting Engineering,
18 Sep. 2025
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The alveolar wall is only one cell thick.—
Bill Frist,
Forbes.com,
18 Sep. 2025
Adjective
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Beyond that, however, pollen’s seemingly impenetrable shell—made up of the biopolymer sporopollenin—had long stumped researchers and limited its use.—
Sandy Ong,
JSTOR Daily,
11 Sep. 2025
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With time, trees even grew in the impenetrable ditch.—
Steven Franck,
San Diego Union-Tribune,
9 Sep. 2025
Adjective
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As dozens would discover over the ensuing centuries, the Arctic Ocean is impassable for most of the year.—
Robin Catalano,
AFAR Media,
15 Sep. 2025
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Or does the game offer alternative options for getting around what might be impassable progression walls?—
ArsTechnica,
ArsTechnica,
11 Sep. 2025
Adjective
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He was acquired, along with closer Victor Vodnik, in a July 2023 trade with the Braves for reliever Pierce Johnson.—
Patrick Saunders,
Denver Post,
17 Sep. 2025
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In the last fortnight alone, Starmer's Deputy Prime Minister and close ally Angela Rayner has resigned after a house tax scandal, triggering a major cabinet reshuffle.—
Holly Ellyatt,
CNBC,
17 Sep. 2025
Adjective
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Fall sowing encourages sturdy plants and earlier blooms, which can be quite beneficial in hot Southern climes.—
Kim Toscano,
Southern Living,
15 Sep. 2025
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The sturdy plastic housings resist fading and cracking and are brown in color to blend with most outdoor surfaces.—
Miles Walls,
Better Homes & Gardens,
15 Sep. 2025
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 18 Sep. 2025.
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