IMPERMEABLE Synonyms: 51 Similar and Opposite Words

impermeable

adjective

(ˌ)im-ˈpər-mē-ə-bəl

Definition of impermeable

as in impervious

impossible to get through or into the wall of security people surrounding the rock band was impermeable

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in tight

not allowing penetration (as by gas, liquid, or light) an impermeable seal on the ancient tomb had preserved the artifacts exceptionally well

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 impermeable As communities grow, natural landscapes are frequently replaced by roads, parking lots, rooftops and other impermeable surfaces. — Patty Templeton-Jones, Forbes.com, 18 Sep. 2026 Rain watered crops, and soaked in to recharge the groundwater that hydrated the city — something that can’t happen now, when something like 40% of the city is covered over, impermeable to rain. — Patt Morrison, Los Angeles Times, 17 Sep. 2026 Playing the American League’s best team, the Padres had the final two games of the series in hand before the practically impermeable back end of their bullpen blew late leads. — Kevin Acee, San Diego Union-Tribune, 31 Aug. 2026 Spain needed until the 106th minute to slip a Ferran Torres shot past the impermeable goalkeeping of Argentina’s Emiliano Martínez, whose championship-game record 11 saves proved one too few. — Jerry Brewer, New York Times, 20 July 2026 See All Example Sentences for impermeable

Recent Examples of Synonyms for impermeable

Adjective

Waititi and co-screenwriter Dahvi Waller seem impervious to that refined sensibility, instead preferring to slather on the quirks, to stunningly charmless effect.

— David Rooney, HollywoodReporter, 20 Oct. 2026
As coastal areas become more developed, impervious surfaces—like roadways, parking lots, rooftops, and sidewalks—have increased.

— Lydia Mansel, Travel + Leisure, 14 Oct. 2026

Definition of impervious

Adjective

Opinion polls predict tight race Domestically, Vucic has pledged higher pensions and public sector salaries, investment in state healthcare and subsidies for young couples.

— Reuters, NBC news, 25 Oct. 2026
Both parties expect whoever wins in November to do so by a tight margin in a state of 738,000 people.

— Arkansas Online, Arkansas Online, 24 Oct. 2026

Definition of tight

Adjective

The world building is easier to understand and less dense than Crescent City, and the tone is also the most indicative of SJM’s writing on the whole; Throne of Glass started as a YA series, then becomes more adult over time.

— Anna Moeslein, Glamour, 24 Oct. 2026
The mollusks can form dense colonies that clog pipes, obstruct water flow and foul boat motors.

— Daniel Hunt, Sacbee.com, 23 Oct. 2026

Definition of dense

Adjective

That album, like the Dio Sabbath classics before it, was fine-tuned for metalhead appreciation, thick with crushing riffs and dramatic vocals.

— Brad Sanders, Pitchfork, 27 Oct. 2026
At just 70 micrometers thick, the artificial skin has an impressive resolution of 847 dots per inch (dpi), fine enough to detail individual fingerprint ridges.

— New Atlas, New Atlas, 27 Oct. 2026

Definition of thick

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

Adjective

With these blue collar parents’ grade-school-age son a tangibly quiet presence, a seemingly impassable unhappiness oozes from the opening scenes.

— Robert Abele, Los Angeles Times, 23 Oct. 2026
Near the Town of Boone, portions of Deerfield Road and Bamboo Road are flooded and impassible.

— NC Weather Bot, Charlotte Observer, 11 Oct. 2026

Definition of impassable

Adjective

Their security infrastructure is more impregnable than that of a bank.

— Gideon Lewis-Kraus, New Yorker, 19 Oct. 2026
Dropped catches from Steve Smith, Green and Travis Head ensured yesterday's brief rally in the field fizzled out and allowed Bangladesh to bat itself into an almost impregnable position.

— ABC News, ABC News, 14 Aug. 2026

Definition of impregnable

Browse Nearby Words

impermanent

impermeable

impermissible

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“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 28 Oct. 2026.

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Synonyms of impermeable

adjective

Example Sentences

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