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
Synonyms & Similar Words
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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Justin Thomas, who looked hopelessly lost on Friday morning, sank a putt on the 18th hole to defeat the seemingly invincible Tommy Fleetwood.—
Kyle Feldscher,
CNN Money,
28 Sep. 2025
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Banner headlines pound away at us that vibe coding is invincible and the cat’s meow.—
Lance Eliot,
Forbes.com,
18 Sep. 2025
Adjective
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Other valuable fruiting plants include elderberry, spicebush (), and native roses, which produce nutrient-dense hips in fall.—
Maria Azzurra Volpe,
MSNBC Newsweek,
1 Oct. 2025
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Since September 2024, a new federal law requires mammogram reports to state whether breast tissue is dense, and to mention the possibility of additional imaging.—
Dr. Megha Gupta,
ABC News,
1 Oct. 2025
Adjective
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Master Chief, much like the Doom Slayer, dwarfed most of his foes and was nigh-on invulnerable.—
Fran Ruiz,
Space.com,
15 Sep. 2025
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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
Adjective
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Others – seemingly those who are non-religious or simply impenetrable by internet theories – quipped at the possibility.—
Melina Khan,
USA Today,
24 Sep. 2025
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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
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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But that doesn't mean Davis is impervious to economic headwinds.—
Laura Hackett,
NPR,
26 Sep. 2025
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Broder was a rare figure that was impervious to the notorious agency wars, commanding respect across agency lines.—
Nellie Andreeva,
Deadline,
24 Sep. 2025
Adjective
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Smith rushed home another score during the third quarter, and the Golden Bulls only padded their insurmountable lead.—
Shane Connuck,
Charlotte Observer,
28 Sep. 2025
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Facing an insurmountable lead, Benbrook added a fourth quarter score, a 13 yard rush from Quentin Thomas.—
Charles Baggarly,
Fort Worth Star-Telegram,
27 Sep. 2025
Adjective
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The storm flooded creeks, toppled trees and washed out roads, especially in Cataloochee Valley, where all trails became impassable.—
Joe Marusak,
Charlotte Observer,
27 Sep. 2025
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The famed route experienced extensive blowdowns, erosion, and landslides, resulting in much of the roadway being impassable after Helene struck in September 2024.—
Graham Hurley,
CNN Money,
21 Sep. 2025
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 3 Oct. 2025.
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