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 dense
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
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
Something technical would surely have been appropriate: Which programming language is most vulnerable, which most impregnable?
—Literary Hub, 1 July 2025
Superstar Harmanpreet Kaur's unbelievable 171 not out that destroyed an impregnable Australia in a remarkable semi-final upset was seen as a turning point.
—Tristan Lavalette, Forbes, 15 Oct. 2024
See All Example Sentences for impregnable
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
Something technical would surely have been appropriate: Which programming language is most vulnerable, which most impregnable?
—Literary Hub, 1 July 2025
Superstar Harmanpreet Kaur's unbelievable 171 not out that destroyed an impregnable Australia in a remarkable semi-final upset was seen as a turning point.
—Tristan Lavalette, Forbes, 15 Oct. 2024
See All Example Sentences for impregnable
Recent Examples of Synonyms for impregnable
Adjective
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But every time you’re done lifting, your brain feels invincible.—
Kristen Rogers,
CNN Money,
1 Sep. 2025
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Here in California, our once-invincible white collar economy is beginning to shatter.—
Michael Bernick,
Forbes.com,
27 Aug. 2025
Adjective
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This happens when its dense stellar corpse is close enough to its companion star to allow its gravity to begin stripping away the partner's stellar material.—
Robert Lea,
Space.com,
16 Sep. 2025
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The resulting configuration provides much denser storage than conventional all flash parallel file systems.—
Thomas Coughlin,
Forbes.com,
16 Sep. 2025
Adjective
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Luthor has always been an ingenious nemesis for the invulnerable Superman: a merely intelligent human, an evildoing Prometheus out to steal fire from our benevolent cape-wearing god.—
Derek Robertson,
The Washington Examiner,
8 Aug. 2025
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But second-strike capabilities are not invulnerable.—
SAM WINTER-LEVY,
Foreign Affairs,
7 Aug. 2025
Adjective
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Beyond that, however, pollen’s seemingly impenetrable shell—made up of the biopolymer sporopollenin—had long stumped researchers and limited its use.—
Sandy Ong,
JSTOR Daily,
11 Sep. 2025
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With time, trees even grew in the impenetrable ditch.—
Steven Franck,
San Diego Union-Tribune,
9 Sep. 2025
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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Various groups develop impervious boundaries, neutralizing the effectiveness of people who have to interact across them.—
Carol Kinsey Goman,
Forbes.com,
25 Aug. 2025
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Modern American popular culture contains many jocular characters that resemble this folkloric bird, who is delightfully impervious to pain, from cartoon characters such as the Road Runner – an actual bird – to the foulmouthed, self-regenerating antihero Deadpool.—
Perin Gürel,
The Conversation,
19 Aug. 2025
Adjective
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Meanwhile, with 76 wins, the Mets face a seemingly insurmountable seven-game deficit to the Phillies, and currently cling to the NL's final Wild Card berth by just four games over the Cincinnati Reds.—
Jon Vankin,
MSNBC Newsweek,
9 Sep. 2025
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Yet, for a team whose defense hardly made any plays for months at a time last season and dug an insurmountable hole by never getting the lucky bounce or break in a zillion one-score losses, there were no apologies.—
Paul Dehner Jr,
New York Times,
8 Sep. 2025
Adjective
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As dozens would discover over the ensuing centuries, the Arctic Ocean is impassable for most of the year.—
Robin Catalano,
AFAR Media,
15 Sep. 2025
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Or does the game offer alternative options for getting around what might be impassable progression walls?—
ArsTechnica,
ArsTechnica,
11 Sep. 2025
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 18 Sep. 2025.
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