1
as in invincible
incapable of being defeated, overcome, or subdued
an impregnable fortress that had foiled one invader after another over the centuries
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
2
as in impervious
impossible to get through or into
the castle's supposedly impregnable walls
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 impregnable
One of the grandest occasions in golf was in 1930, when the great Bobby Jones won the British Amateur at St. Andrews and then captured the claret jug at Royal Liverpool on his way to winning the Grand Slam of that era — the impregnable quadrilateral, as it was called.
—
Doug Ferguson, Chicago Tribune, 16 July 2025
Needless to say, Superman regains his identity in time for a final assault on a supposedly impregnable computer designed by Pryor and manned by Vaughn and his formidable sister (Annie Ross), and hidden away somewhere in the Grand Canyon.
—Arthur Knight, HollywoodReporter, 7 July 2025
As a result, homeowners and developers are reconsidering their approach to luxury living, emphasizing fire-resistant materials, impregnable landscaping, and cutting-edge smart-home technologies.
—Abby Montanez, Robb Report, 6 July 2025
Japanese airpower destroyed supposedly impregnable British battle cruisers in the Pacific at the outset of World War II.
—Michael C. Horowitz, Foreign Affairs, 4 July 2025
See All Example Sentences for impregnable
Doug Ferguson, Chicago Tribune, 16 July 2025
Needless to say, Superman regains his identity in time for a final assault on a supposedly impregnable computer designed by Pryor and manned by Vaughn and his formidable sister (Annie Ross), and hidden away somewhere in the Grand Canyon.
—Arthur Knight, HollywoodReporter, 7 July 2025
As a result, homeowners and developers are reconsidering their approach to luxury living, emphasizing fire-resistant materials, impregnable landscaping, and cutting-edge smart-home technologies.
—Abby Montanez, Robb Report, 6 July 2025
Japanese airpower destroyed supposedly impregnable British battle cruisers in the Pacific at the outset of World War II.
—Michael C. Horowitz, Foreign Affairs, 4 July 2025
See All Example Sentences for impregnable
Recent Examples of Synonyms for impregnable
Adjective
-
At the premiere of The Godfather in 1972, Evans felt utterly invincible.—
Hadley Hall Meares,
Vanity Fair,
9 Feb. 2026
-
Thirteen wins on the trot, and chasing the Women’s Super League record of 19 victories in one season, looking all the more invincible with Kerolin’s return, Andree Jeglertz’s calm approach and Bunny Shaw’s form.—
Megan Feringa,
New York Times,
4 Feb. 2026
Adjective
-
And the PlumaFill proved impervious to moisture, too.—
Kelly Bastone,
Outside,
10 Feb. 2026
-
There have been concussions, and the right knee seemingly impervious to staying healthy.—
Will Graves,
Twin Cities,
8 Feb. 2026
Adjective
-
That is partly because no other power had enjoyed America’s unique circumstances—largely invulnerable to foreign invasion, because of its strength and its distance from the other great powers, and thus able to deploy force thousands of miles from home without leaving itself at risk.—
Robert Kagan,
The Atlantic,
18 Jan. 2026
-
Moreover, a culture where everyone tries to look invulnerable is harmful.—
Jason Ma,
Fortune,
26 Oct. 2025
Adjective
-
Another category that would likely unnerve boards of directors, according to Minow, is close ties with Epstein following his controversial 2008 guilty plea to procuring a minor for prostitution.—
Matt Egan,
CNN Money,
18 Feb. 2026
-
With Jackson’s death Tuesday, leaders across the region reflected on a legacy that helped shape a generation of local activism and public service — none more so than Oakland Mayor Barbara Lee, a close friend for more than five decades.—
Grant Stringer,
Mercury News,
18 Feb. 2026
Adjective
-
The seemingly unconquerable fig butterwort (Ficaria verna) invades lowland valleys where seasonal floods carry little broken off bits downstream to sprout anywhere and everywhere.—
Paul Cappiello,
The Courier-Journal,
15 Aug. 2025
-
Mountains as towering, imposing and seemingly unconquerable landscapes have been metaphorically linked to power and challenge.—
Jenny Hall,
CNN Money,
14 May 2025
Adjective
-
The Antarctic Ocean is heavily layered, or stratified, to a depth of around 1,000 meters (3,280 feet) because of conflicting properties including colder, denser water from below not readily mixing with fresh water running off melting ice from above.—
CNN Money,
CNN Money,
18 Feb. 2026
-
For the first time, the researchers demonstrated that human spinal cord organoids can reproduce the formation of dense glial scars, which block nerve regeneration.—
Neetika Walter,
Interesting Engineering,
17 Feb. 2026
Adjective
-
Mullins took the lid off the rim with his fifth 3-pointer of the night, but the Bluejays kept getting shots to fall and built an insurmountable lead.—
Joe Arruda,
Hartford Courant,
19 Feb. 2026
-
Powered by the trio of Kingston Flemming, Matteo Lee and Reynel Villar, the Lions slowly chipped away at their seemingly insurmountable deficit.—
Brendan Connelly,
Boston Herald,
16 Feb. 2026
Adjective
-
Blogs, tweets, and podcasts bypass traditional gatekeepers, bringing a wider array of voices into literary spaces that once seemed impenetrable.—
Literary Hub,
Literary Hub,
18 Feb. 2026
-
For decades, Silicon Valley has maintained a nearly impenetrable legal perimeter in the form of Section 230 of the Communications Decency Act, a 1996 law that allows tech companies to avoid legal responsibility for what its users post.—
Bobby Allyn,
NPR,
18 Feb. 2026
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 22 Feb. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
