1
as in impervious
impossible to get through or into
the wall of security people surrounding the rock band was impermeable
Synonyms & Similar Words
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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
My father’s 1930s interviews tell stories of couples who defied Chicago’s seemingly impermeable color line.
—
Dorothy Roberts, Time, 13 Feb. 2026
Driveway materials can be impermeable or permeable—so traditional concrete and asphalt, or a pervious solution that allows rainwater to pass through.
—Alexandra Kelly, Martha Stewart, 9 Feb. 2026
The impermeable seed coat strategy generally helps survival of the species by making sure all of a season’s crop don’t germinate in the same year.
—Paul Cappiello, Louisville Courier Journal, 21 Nov. 2025
The discovery could enable large-scale use of impermeable coatings once limited by graphene’s scalability issues.
—Aamir Khollam, Interesting Engineering, 12 Nov. 2025
See All Example Sentences for impermeable
Dorothy Roberts, Time, 13 Feb. 2026
Driveway materials can be impermeable or permeable—so traditional concrete and asphalt, or a pervious solution that allows rainwater to pass through.
—Alexandra Kelly, Martha Stewart, 9 Feb. 2026
The impermeable seed coat strategy generally helps survival of the species by making sure all of a season’s crop don’t germinate in the same year.
—Paul Cappiello, Louisville Courier Journal, 21 Nov. 2025
The discovery could enable large-scale use of impermeable coatings once limited by graphene’s scalability issues.
—Aamir Khollam, Interesting Engineering, 12 Nov. 2025
See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
Adjective
-
The Calabria some outside Italy do already know is the Costa degli Dei, or Coast of the Gods, a 34-mile stretch of Tyrrhenian shore from Pizzo to Nicotera (think of it as the knuckle on the Calabrian toe), where long white beaches alternate with impervious cliffs and rocky coves.—
Lee Marshall,
Condé Nast Traveler,
9 May 2026
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An expert home baker who taught me how to make perfectly short pie crust, Karen was impervious to the cold and would show up at our house on 30-degree days wearing shorts.—
Jennifer Acker,
PEOPLE,
8 May 2026
Adjective
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But as the season has progressed and the pressure has increased, their margins of victory have become tighter.—
Dean Jones,
New York Times,
13 May 2026
-
Cornyn’s legislation comes as the four-term senator is locked in a tight GOP primary contest against Texas Attorney General Ken Paxton.—
Lauren Green,
The Washington Examiner,
12 May 2026
Adjective
-
In cases of near-zero visibility due to dense fog, initiate your hazard lights and locate a secure spot, such as a nearby business parking area, to pull over and come to a halt.—
NC Weather Bot,
Charlotte Observer,
12 May 2026
-
However, what really gives these native plants staying power is their easy-care vibe and ability to form a dense, groundcovering mat of foliage and blooms in just a year or two.—
Lauren Landers,
The Spruce,
12 May 2026
Adjective
-
Pantelleria Closer to Tunisia than mainland Italy, Pantelleria is a remote volcanic island dotted with traditional dammusi, thick-walled, domed stone dwellings built to keep out the heat.—
Nicky Swallow,
Travel + Leisure,
17 May 2026
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Rodriguez Singh appeared behind the thick visitation glass, just feet away, seemingly prepared to talk.—
Doug Dunbar,
CBS News,
16 May 2026
Adjective
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Sources close to Canvot, speaking anonymously to protect relationships, have told The Athletic that the message from Glasner after that error was simple.—
Matt Woosnam,
New York Times,
13 May 2026
-
López was one of the fiercest critics of then-Mayor Fúnez, a supporter of the mine and close ally of Honduras’ former president, Xiomara Castro.—
Marlon González,
Los Angeles Times,
13 May 2026
Adjective
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When faced with a unified, impenetrable front that raises the geopolitical costs of his disruption, Trump simply moves on.—
Jeffrey Sonnenfeld,
Time,
11 May 2026
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Elite defenses have increasingly tested and thwarted Denver’s once-impenetrable two-man game in the playoff moments that often steer front offices in their decision-making.—
Bennett Durando,
Denver Post,
1 May 2026
Adjective
-
Faced with an impassable strait, carriers did not hold vessels in indefinite anchorage.—
Glenn Taylor,
Footwear News,
7 May 2026
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Many of the landmarks along the Byway are only open during the warm season, and heavy snowstorms and ice make some sections impassable during winter.—
Cu Fleshman,
Travel + Leisure,
3 May 2026
Adjective
-
The multiple attacks could be a major victory for the jihadis in a city seen as impregnable, despite attackers often targeting troops and villages on the outskirts of the city.—
Haruna Umar,
Los Angeles Times,
17 Mar. 2026
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The multiple attacks could be seen as a major victory for the jihadis in a city seen as impregnable despite the jihadis often targeting troops and villages on the outskirts of the city.—
ABC News,
ABC News,
16 Mar. 2026
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 18 May. 2026.
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