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
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Antonyms & Near Antonyms
2
as in impervious
impossible to get through or into
the castle's supposedly impregnable walls
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Antonyms & Near Antonyms
Example Sentences
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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
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Jim has always hovered over the abyss with a smile, drunken and invincible, always making people laugh.—
Literary Hub,
Literary Hub,
28 Jan. 2026
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But the Thunder aren’t invincible, and back-to-back home losses to the Pacers and Raptors were the latest reminder of Oklahoma City’s mortality.—
Law Murray,
New York Times,
26 Jan. 2026
Adjective
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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
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The dressing room is more impervious to external influence than any other in European football.—
Sebastian Stafford-Bloor,
New York Times,
14 Jan. 2026
Adjective
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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
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Moreover, a culture where everyone tries to look invulnerable is harmful.—
Jason Ma,
Fortune,
26 Oct. 2025
Adjective
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In recent years, Rivkin has formed a close bond with Olga Smirnova, a clinical social worker who visits him weekly through a home-visit program run by Maimonides Medical Center.—
Hannah Kliger,
CBS News,
28 Jan. 2026
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Meanwhile, Mémoires Colorées was born out of Patrick Frey’s (who currently helms Pierre Frey) close friendship with Belgian artist and paper sculptor Isabelle de Borchgrave.—
Stephanie Sporn,
Vogue,
27 Jan. 2026
Adjective
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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
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Mountains as towering, imposing and seemingly unconquerable landscapes have been metaphorically linked to power and challenge.—
Jenny Hall,
CNN Money,
14 May 2025
Adjective
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The dense fumes from nearby industrial facilities often float into the purview of cinematographer Tyson Perkins, a reminder of the harsh, isolated backdrop where the narrative unfurls.—
Carlos Aguilar,
Variety,
27 Jan. 2026
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The sleeveless sheath featured a deep V-neckline and strong, slightly extended shoulders, with sequins running in dense rows throughout.—
Maggie Clancy,
Footwear News,
27 Jan. 2026
Adjective
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Look to Unexpected Places Small closets have their challenges, and nothing seems quite so insurmountable as finding space where there doesn’t appear to be any.—
Patricia Shannon,
Better Homes & Gardens,
29 Jan. 2026
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Any sincere, unbiased conversation about artificial intelligence has to begin by acknowledging how insurmountable the topic really is.—
Christian Zilko,
IndieWire,
27 Jan. 2026
Adjective
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Getting a loan approved could open doors that were previously closed to you, and receiving help and support from others could melt walls that previously felt impenetrable.—
Steph Koyfman,
Condé Nast Traveler,
29 Jan. 2026
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In a refreshing departure from so many impenetrable Marvel series past, creators Deston Daniel Cretton and Andrew Guest expediently fill in viewers on the essential points of Trevor’s backstory.—
Judy Berman,
Time,
26 Jan. 2026
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 2 Feb. 2026.
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