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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Try sprouted seeds lightly roasted with a sprinkle of sea salt for a nutrient-dense, crunchy snack.—
Jillian Kubala,
Health,
14 Oct. 2025
-
Hacking a path through dense jungle with a machete.—
Kit Bernardi,
USA Today,
14 Oct. 2025
Adjective
-
That confusion is further reflected by the manic hyper-subjectivity of Bronstein’s filmmaking, which boxes Linda into a close-up so tight that everything around her — especially her unnamed daughter, who almost never appears on screen — might as well be a disembodied echo of her own anxiety.—
David Ehrlich,
IndieWire,
10 Oct. 2025
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Like Lawrence, Sam Darnold isn’t squeamish about passing into tight windows or risking an INT blemish.—
Steven Louis Goldstein,
New York Times,
10 Oct. 2025
Adjective
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But that doesn't mean Davis is impervious to economic headwinds.—
Laura Hackett,
NPR,
26 Sep. 2025
-
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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That thick sole relieves pressure and pain, especially pain associated with conditions like plantar fasciitis.—
Olivia Young,
Travel + Leisure,
8 Oct. 2025
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The smoke was thick enough to cast its own shadows upon the hill.—
Caity Weaver,
The Atlantic,
8 Oct. 2025
Adjective
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But there’s nothing impenetrable about that film.—
Zac Ntim,
Deadline,
8 Oct. 2025
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The timepiece that helped cement Rolex as a maker of impenetrable tool watches is heading to auction this fall.—
Rachel Cormack,
Robb Report,
6 Oct. 2025
Adjective
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Several private roads were impassable Monday due to Vallecito Creek and Grimes Creek flooding over the banks.—
Lauren Penington,
Denver Post,
13 Oct. 2025
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In Delaware and New Jersey, particularly the southern part of the state, coastal flooding could get bad enough to cause some roads to become impassible and some structures to flood, according to the National Weather Service in Mount Holly, New Jersey.—
Mary Gilbert,
CNN Money,
11 Oct. 2025
Adjective
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What to Know For Dedication Night, a family member or close friend will join each celebrity for their dedication dance.—
Amanda Castro,
MSNBC Newsweek,
15 Oct. 2025
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The Andromeda Galaxy The Andromeda Galaxy lies almost directly overhead in the hours surrounding midnight on October nights, presenting a perfect opportunity to observe the Milky Way's closest neighbor without the atmospheric interference that comes from being close to the horizon.—
Anthony Wood,
Space.com,
14 Oct. 2025
Adjective
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If possible, drive to a nearby sturdy building.—
CA Weather Bot,
Sacbee.com,
13 Oct. 2025
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If possible, drive to a nearby sturdy building.—
NC Weather Bot,
Charlotte Observer,
12 Oct. 2025
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 16 Oct. 2025.
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