1
as in impervious
impossible to get through or into
the wall of security people surrounding the rock band was impermeable
Synonyms & Similar Words
Relevance
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
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of impermeable
Which means the bigger the economy, the greater the means to erect an impermeable national defense system.
—
John Tamny, Forbes.com, 12 Sep. 2025
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
See All Example Sentences for impermeable
John Tamny, Forbes.com, 12 Sep. 2025
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
See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
Adjective
-
Trump, however, is impervious to legal restraints.—
Christine Ledbetter,
Chicago Tribune,
4 Jan. 2026
-
Rates for commercial and industrial properties will be increased based on impervious surface and square footage.—
Samuel O'Neal,
Fort Worth Star-Telegram,
26 Dec. 2025
Adjective
-
This is a major step forward in Japan’s long and cautious return to nuclear power and comes as the country braces for tight electricity supplies ahead of the summer peak.—
Kaif Shaikh,
Interesting Engineering,
21 Jan. 2026
-
Those looking for an elevated alternative to loose sweatpants, restrictive jeans, and tight leggings will appreciate their lightweight and airy feel.—
Michelle Baricevic,
Travel + Leisure,
21 Jan. 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.—
Bay Area Weather Report,
Mercury News,
21 Jan. 2026
-
In situations of near-zero visibility due to dense fog, activate your hazard lights and seek a secure location, such as a nearby business’s parking lot, to pull over and come to a stop.—
Southern California Weather Report,
Oc Register,
21 Jan. 2026
Adjective
-
What remains, the thick, black, and dense oil, required special techniques to be brought to the surface.—
Scott Montgomery,
Forbes.com,
25 Jan. 2026
-
As a Boston native, Stone’s accent is thicker than chowdah, bless her, with a laugh that lilts like a fly ball onto Lansdowne Street.—
Sean Keeler,
Denver Post,
25 Jan. 2026
Adjective
-
Trump has formed close alliances with conservative tech figures, including Tesla CEO Elon Musk and investor David Sacks, who serves as the White House AI and crypto czar.—
Joseph Menn The Washington Post,
Arkansas Online,
21 Jan. 2026
-
Discussions with partners, spouses and close friends will be clear-headed and direct.—
Georgia Nicols,
Denver Post,
21 Jan. 2026
Adjective
-
BitLocker’s encryption algorithms have proven impenetrable to prior law enforcement attempts to break in, according to a Forbes review of historical cases.—
Thomas Brewster,
Forbes.com,
23 Jan. 2026
-
All night, the fog had stubbornly hidden the stars in the dark, impenetrable sky, but now the sliver of light widened little by little into a luminous band, a hazy phosphorescence that slowly spread and took over.—
Literary Hub,
Literary Hub,
22 Jan. 2026
Adjective
-
Ice and snow covered roadways will become treacherous and impassable.—
NC Weather Bot,
Charlotte Observer,
24 Jan. 2026
-
Local officials and weather forecasters have urged Texans to stay off roads this weekend unless absolutely necessary, as ice and snow may make some roads impassable.—
Lauren Caruba,
Dallas Morning News,
23 Jan. 2026
Adjective
-
But their quarterback issues could make those defenses look impregnable.—
Kevin Cusick,
Twin Cities,
30 Nov. 2025
-
OpenAI wasn’t a fortress, wasn’t impregnable.—
Jim Cramer,
CNBC,
16 Nov. 2025
Cite this Entry
“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 27 Jan. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
