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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Accomplished at riding these vehicles and feeling invincible, I was shocked as anyone at the extent of damage to my right elbow as a result of the fall.—
Scott Kramer,
Forbes.com,
14 Aug. 2025
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The giant cactus is exceptionally resilient and long-lived—but not invincible.—
The Editors,
JSTOR Daily,
25 July 2025
Adjective
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Open star clusters typically reside in the dense spiral arms of the Milky Way, where the gravity of passing stars can tug at their outermost members, pulling them apart over the course of millions of years.—
Anthony Wood,
Space.com,
17 Aug. 2025
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Finally, it is baked into a dense, tangy loaf that resembles French bread.—
Gabi De la Rosa,
Southern Living,
17 Aug. 2025
Adjective
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But second-strike capabilities are not invulnerable.—
SAM WINTER-LEVY,
Foreign Affairs,
7 Aug. 2025
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Both have inspired a literature far out of proportion to the sordid events, perhaps because each holds a certain moral voltage: evidence that even the invulnerable can be undone, that anything can be fixed, and that anyone can be killed.—
Adam Gopnik,
New Yorker,
4 Aug. 2025
Adjective
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Frere-Jones manages to make Hardwick’s sometimes impenetrable prose sound like the coolest hat trick.—
Brittany Allen,
Literary Hub,
24 July 2025
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Royal carriages are, of course, not quite as impenetrable as the presidential state car, nicknamed The Beast.—
Jack Royston,
MSNBC Newsweek,
15 July 2025
Adjective
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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
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The Latin word Invictus means unconquerable or undefeated.—
Lissete Lanuza Sáenz,
StyleCaster,
18 Apr. 2025
Adjective
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In the movies, zombies are impervious to knives, guns, katanas, spiked baseball bats and most other weapons an inventive auteur can think up.—
Jason Rose,
Forbes.com,
6 Aug. 2025
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For instance, more construction in an area can lead to more impervious surfaces that retain water or shunt it toward a certain neighborhood.—
Umair Irfan,
Vox,
4 July 2025
Adjective
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As Republicans scramble in the aftermath, our campaign will continue to build insurmountable momentum needed to win next November.—
Kate Plummer,
MSNBC Newsweek,
8 Aug. 2025
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At first glance, those numbers are insurmountable for a state that just closed the fiscal year with a $2.6 billion surplus equal to 10% of its entire General Fund.—
Keith M. Phaneuf,
Hartford Courant,
8 Aug. 2025
Adjective
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Numerous roads will likely be impassable under several feet of water and vehicles will likely be submerged.—
NC Weather Bot,
Charlotte Observer,
18 Aug. 2025
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In spring, melting ice turns them into impassable mud and floods.—
David Nikel,
Forbes.com,
16 Aug. 2025
Cite this Entry
“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 23 Aug. 2025.
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