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
The film starts on the morning of February 17 2003, when detectives from Antwerp’s infamous ‘Diamond Squad’ were called to investigate the night-time robbery of an allegedly impregnable vault in the middle of the Belgian city, which is nicknamed the City of Diamonds.
—
Max Goldbart, Deadline, 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
Max Goldbart, Deadline, 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
-
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
-
Jim has always hovered over the abyss with a smile, drunken and invincible, always making people laugh.—
Literary Hub,
Literary Hub,
28 Jan. 2026
Adjective
-
There have been concussions, and the right knee seemingly impervious to staying healthy.—
Will Graves,
Twin Cities,
8 Feb. 2026
-
Opponents said McLean’s plan would cut down 17 acres of trees and add 7 acres of impervious surfaces, worsening the periodic flooding that’s already a concern.—
Don Stacom,
Hartford Courant,
23 Jan. 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
-
Over the years, Grey and Pollan have remained close, often supporting one another through personal and professional milestones.—
Danielle Minnetian,
FOXNews.com,
10 Feb. 2026
-
The bus depot is two stories beneath the train platform and several blocks from the closest stairway.—
DP Opinion,
Denver Post,
10 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
-
For years, astronomers have debated whether planets this massive could form through core accretion, the slow, bottom-up process in which solid material clumps together into a dense core that then pulls in vast amounts of gas.—
Samantha Mathewson,
Space.com,
10 Feb. 2026
-
In Earth’s deep interior and under enormous pressure, a dense, hot and fluid metal core began to churn.—
Mindy Weisberger,
CNN Money,
10 Feb. 2026
Adjective
-
The dilemma seemed insurmountable at the time.—
Simon Shuster,
The Atlantic,
10 Feb. 2026
-
The filing argues that custody is a nonwaivable jurisdictional requirement and that remote court proceedings would raise insurmountable problems, including the inability to verify identities, enforce perjury laws, or protect classified information.—
Kaelan Deese,
The Washington Examiner,
9 Feb. 2026
Adjective
-
Mexico’s iconic Yucatan Peninsula is a place of contrasts, where impenetrable jungle meets wide open ocean, lush vegetation meets sandy shores, and vibrant energy meets pure serenity.—
Condé Nast Traveler,
Condé Nast Traveler,
5 Feb. 2026
-
To a dog, our fervent and prolonged goodbyes at the front door might seem as peculiar and impenetrable as the greetings of an orca do to us.—
Shayla Love,
New Yorker,
4 Feb. 2026
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 15 Feb. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
