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

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in impervious

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

Synonyms & Similar Words

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

In some Bengali traditions, Vijayadashami rituals include Aparajita Puja, the worship of the goddess in her invincible form, sometimes represented by the butterfly pea plant.

— Encyclopedia Britannica, Encyclopedia Britannica, 9 Oct. 2026
Of course, an extra three-quarters of an inch clearance and some elastic straps do not transform a unibody, front-biased crossover into an invincible rock-crawling monster.

— New Atlas, New Atlas, 9 Oct. 2026

Definition of invincible

Adjective

Over the summer, the Commanders’ coach, Dan Quinn, dreaming up ways to make his staff more impervious to pressure, enlisted the help of the intelligence establishment of the United States.

— Vinson Cunningham, New Yorker, 9 Oct. 2026
Josh Allen is elite, but the Bills aren’t impervious to problems — check out the Chargers game.

— Los Angeles Times, Los Angeles Times, 8 Oct. 2026

Definition of impervious

Adjective

With six couples, having two separate houses gave us space to spread out while keeping everyone close enough to gather for dinner, drinks, and games.

— Jessica Chapel, Condé Nast Traveler, 17 Oct. 2026
These regions could warrant closer investigation, but the assessment does not establish that any is suitable for a future greenhouse.

— Rupendra Brahambhatt, Interesting Engineering, 17 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

The Oscars love sprawling biopics, underdogs and triumphant stories in which seemingly insurmountable obstacles are eventually overcome.

— Clayton Davis, Variety, 8 Oct. 2026
Of course, the Dodger bullpen almost handed the game back to them when Ozzie Albies hit a two-run homer off Tanner Scott in the ninth to close what seemed to be an insurmountable gap.

— Los Angeles Times, Los Angeles Times, 3 Oct. 2026

Definition of insurmountable

Adjective

But the Broncos aren’t just about putting the ball in the back of the net — their defense has allowed just six goals all season and is led by near-impenetrable sophomore goalkeeper Ava de Leest.

— Shaun Goodwin, Idaho Statesman, 17 Oct. 2026
Even top experts have found OpenAI’s proof of blowup to be completely impenetrable.

— Joseph Howlett, Scientific American, 13 Oct. 2026

Definition of impenetrable

Podcast

Cite this Entry

Style

“Impregnable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impregnable. Accessed 20 Oct. 2026.

Copy Citation

Synonyms of impregnable

adjective

Example Sentences

Browse Nearby Words

Podcast

Cite this Entry

More from Merriam-Webster

Word of the Day

compunction

Popular in Grammar & Usage

'Affect' vs. 'Effect'

Merriam-Webster’s Great Big List of Words You Love to Hate

The Exceptions of '-s' and '-es' Plurals

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

Did 'orange' the fruit or the color come first?

Popular

'Affect' vs. 'Effect'

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'

Games & Quizzes