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

Maceta stood contemplating the invincible green of the pastureland.

— Literary Hub, Literary Hub, 14 Aug. 2026
However, despite the hype and their high World Series odds, the Dodgers are not invincible.

— Dan Freedman, Forbes.com, 4 Aug. 2026

Definition of invincible

Adjective

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
For Ross, this gives the character a steadier presence than the standard invulnerable operative often found in genre fiction.

— Matt Emma, USA Today, 29 July 2026

Definition of invulnerable

Adjective

This is something the First Alert Weather Team will keep a close eye on throughout the week.

— Michael Autovino, CBS News, 17 Aug. 2026
Makhachev’s record-setting victory came over Ian Machado Garry via unanimous decision (49-46, 49-46, 48-47) in one of Makhachev’s closest fights.

— Mark Puleo, New York Times, 16 Aug. 2026

Definition of close

Adjective

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
The Spurs led for more minutes than the Knicks and built seemingly unconquerable leads.

— Dana O’Neil, CNN Money, 14 June 2026

Definition of unconquerable

Adjective

Elevated on an all-wood frame and ringed by tall evergreens, the home feels like a slice of Lake Tahoe in the middle of a dense suburb.

— David Caraccio, Sacbee.com, 15 Aug. 2026
They are being sculpted by intense radiation from nearby young stars, while new stars are forming inside the dense clouds.

— Kaif Shaikh, Interesting Engineering, 15 Aug. 2026

Definition of dense

Adjective

The rule also failed to tackle all of the ways trusts and other vehicles provide impenetrable secrecy for the wealthy and the crooked alike.

— Casey Michel, The Atlantic, 14 Aug. 2026
Cody erects impenetrable emotional walls around him that deny him from asking for help and creating community.

— Randy Myers, Mercury News, 12 Aug. 2026

Definition of impenetrable

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“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 23 Aug. 2026.

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Synonyms of impregnable

adjective

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