IMPREGNABLE Synonyms: 83 Similar and Opposite Words

impregnable

adjective

im-ˈpreg-nə-bəl

Definition of impregnable

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

as in impervious

impossible to get through or into the castle's supposedly impregnable walls

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of impregnable Alexander the Great conquered it in 332 BCE after building a causeway to what had been considered an impregnable island fortress. — Jane Arraf, NPR, 23 June 2026 On that occasion a team made up of players who had all been born in Haiti shocked an Italy team famed for its impregnable defense. — Laurent Dubois, The Conversation, 10 June 2026 The multiple attacks could be a major victory for the jihadis in a city seen as impregnable, despite attackers often targeting troops and villages on the outskirts of the city. — Haruna Umar, Los Angeles Times, 17 Mar. 2026 Already fairly impregnable, the Oscars for years has been protected in public view and behind the scenes by a series of federal, regional and local law enforcement groups and departments working in coordination under the auspices of the LAPD. — Dominic Patten, Deadline, 11 Mar. 2026 See All Example Sentences for impregnable

Recent Examples of Synonyms for impregnable

Adjective

Hearing Ryan talk about particularly the metaphor for AIDS and what AIDS meant to him, and that AIDS was quite literally a thing killing beautiful young people in the ‘80s; people who felt untouchable and invincible.

— Jackie Strause, HollywoodReporter, 10 Sep. 2026
Cameron keeps upping the ante, until one becomes convinced the T-1000 is well-nigh invincible.

— ArsTechnica, ArsTechnica, 28 Aug. 2026

Definition of invincible

Adjective

None of the eight simulations were impervious to the threats, and even when agents detected a risk, the detection didn’t translate into the agents trying to contain the threat.

— Jake Angelo, semafor.com, 15 Sep. 2026
Many Russians may not regard Putin’s regime as solicitous of the public good, which could explain the withdrawal of capital from the country, but the regime is also accepted as a given, a distant presence impervious to outside influence.

— MICHAEL KIMMAGE, Foreign Affairs, 14 Sep. 2026

Definition of impervious

Adjective

Why does Gleb discount the power of those words and feel himself invulnerable?

— Deborah Treisman, New Yorker, 27 Sep. 2026
Google also doesn’t claim that SynthID is invulnerable—the original paper on the technology notes that the watermark is not intended to withstand adversarial attacks.

— ArsTechnica, ArsTechnica, 29 July 2026

Definition of invulnerable

Adjective

The first five conditions describe any lasting affectionate bond, such as a close friendship.

— Pascal Vrticka, Scientific American, 4 Oct. 2026
While formally a candidate for European Union membership, Serbia’s accession process has stalled under Vucic, who maintains close ties with Russia and China.

— ABC News, ABC News, 3 Oct. 2026

Definition of close

Adjective

But the advent of NIL has turned the gap into an unconquerable chasm.

— Dana O’Neil, CNN Money, 6 Sep. 2026
The rescue party made its way to New York harbor by train, private car, and then two bicycles shared among the three of them—Frank, Sarah’s husband, on one; Sarah and Billo on the other—when shipyard traffic proved unconquerable by automobile.

— Claire Carusillo, Harpers Magazine, 4 Aug. 2026

Definition of unconquerable

Adjective

On paper, director Tom McCarthy‘s latest film, A Statement might appear to be a dense polemic, hardly the stuff of exciting moviemaking.

— Pete Hammond, Deadline, 3 Oct. 2026
This show brings back the lighter stand-alone episode structure of the original's early seasons, with a less dense art style.

— K. Thor Jensen, PC Magazine, 2 Oct. 2026

Definition of dense

Adjective

But complex, long-term construction projects can change drastically, or face insurmountable roadblocks, over their development cycles.

— Kevin Breuninger, CNBC, 28 Sep. 2026
Austria made the Final 8 after Jurji Rodionov beat Belgium’s Zizou Bergs 7-6, 6-3 to build an insurmountable 3-1 advantage.

— ABC News, ABC News, 19 Sep. 2026

Definition of insurmountable

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“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 9 Oct. 2026.

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Synonyms of impregnable

adjective

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