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 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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Goldens typically have longer, wavier coats, while Labs have shorter, dense double coats.—
Lydia Patrick,
MSNBC Newsweek,
9 Sep. 2025
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Available in just about every color of the rainbow, the flower heads range from tight buttons and dense domes to soft, feathery blooms.—
Kim Toscano,
Southern Living,
8 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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This is all meant to be impenetrable to outsiders, which is one reason for the confusion that follows shootings such as the one in Minneapolis.—
Charlie Warzel,
The Atlantic,
4 Sep. 2025
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Yet, across the water, a seemingly impenetrable wall of the invasive plants sways in the wind, several feet tall.—
Adriana Pérez,
Chicago Tribune,
31 Aug. 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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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
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Big Thief has endured both, and for years, their very survival seemed to suggest that no rupture was insurmountable.—
Emma Madden,
Pitchfork,
4 Sep. 2025
Adjective
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Idaho 21 near Stanley is back open after a mudslide made a nearly 12-mile stretch of the road impassable after heavy rains Tuesday.—
Shannon Tyler,
Idaho Statesman,
29 Aug. 2025
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The National Hurricane Center has warned that roads in the low-lying barrier islands will become impassable, with powerful waves of 15 to 20 feet crashing ashore.—
Dinah Voyles Pulver,
USA Today,
22 Aug. 2025
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 12 Sep. 2025.
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