1
as in invincible
incapable of being defeated, overcome, or subdued
an impregnable fortress that had foiled one invader after another over the centuries
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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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Here was this guy who looked invincible, and in many ways was, but at the same time he was broken inside.—
Scott Feinberg,
HollywoodReporter,
2 Jan. 2026
-
Democrats once seemed invincible along the Texas-Mexico border, but the party's grip has slipped.—
John C. Moritz,
Austin American Statesman,
19 Dec. 2025
Adjective
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Trump, however, is impervious to legal restraints.—
Christine Ledbetter,
Chicago Tribune,
4 Jan. 2026
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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
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Moreover, a culture where everyone tries to look invulnerable is harmful.—
Jason Ma,
Fortune,
26 Oct. 2025
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Michelle exists on a level that is invulnerable to reproach, termination, or cancellation.—
Justin Chang,
New Yorker,
24 Oct. 2025
Adjective
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Traffic concerns remained a prominent theme of the more than 100 emails the city received in early December, but many people expressed excitement at the prospect of a closer Costco.—
Rose Evans
January 8,
Idaho Statesman,
8 Jan. 2026
-
The Clippers raced to a 14-5 lead, but the Knicks answered with eight straight points and the game was close for the first three quarters.—
CBS News,
CBS News,
8 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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In extremely dense fog where visibility is near zero, the best course of action is to first turn on your hazard lights, then simply pull into a safe location such as a parking lot of a local business, and stop.—
NC Weather Bot,
Charlotte Observer,
8 Jan. 2026
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At 6-foot-3, 275 pounds, Bain’s measurables might not fit every team’s wish list but would work well in Kansas City, where defensive coordinator Steve Spagnuolo has preferred dense and powerful pass rushers.—
Pete Grathoff,
Kansas City Star,
7 Jan. 2026
Adjective
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This will benefit borrowers who will no longer be pushed into insurmountable debt to finance degrees that do not pay off.—
Suzanne Blake,
MSNBC Newsweek,
7 Nov. 2025
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None of these are insurmountable obstacles, of course; with a large enough investment of resources, practically anything is possible.—
Big Think,
Big Think,
6 Nov. 2025
Adjective
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Miami has rekindled memories of its 2001 national championship team behind a defense that went from porous to nearly impenetrable in its first season under coordinator Corey Hetherman.—
Fiifi Frimpong,
New York Daily News,
9 Jan. 2026
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Miami has rekindled memories of its 2001 national championship team behind a defense that went from porous to nearly impenetrable in its first season under coordinator Corey Hetherman.—
Dallas Morning News,
Dallas Morning News,
8 Jan. 2026
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 12 Jan. 2026.
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