impermeable

adjective

(ˌ)im-ˈpər-mē-ə-bəl How to pronounce impermeable (audio)
Definition of impermeablenext
1
as in impervious
impossible to get through or into the wall of security people surrounding the rock band was impermeable

Synonyms & Similar Words

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Antonyms & Near Antonyms
2
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 Engineers eventually replaced them with a version made up of 20 impermeable compartments of high-pressure hoses containing water. — Mack Degeurin, Popular Science, 18 June 2026 Dry waterproofing technology, which is basically like an invisible, impermeable sock liner. — Olivia Young, Travel + Leisure, 29 May 2026 The spongy material is mostly made of air, yet nearly impermeable to both air and liquid. — Brandee Gruener, Southern Living, 29 Apr. 2026 When a finger contacts an impermeable surface, sweat pores within the ridges release moisture that plasticizes the skin’s keratin layer, which increases friction in turn. — Scott Travers, Forbes.com, 14 Apr. 2026 See All Example Sentences for impermeable
Recent Examples of Synonyms for impermeable
  1. impervious
  2. tight
  3. dense
  4. thick
  5. close
  6. impenetrable
  7. impassable
  8. impregnable
Adjective
  • Properties with at least five acres of impervious surface will be subject to the rules.
    — Ian James, Los Angeles Times, 29 July 2026
  • Since her move, Hampton has established herself as England’s No 1 and one of the WSL’s most impervious goalkeepers.
    — Megan Feringa, New York Times, 28 July 2026
Definition of impervious
Adjective
  • The city is considering imposing tighter curfew rules, for example.
    — Rebecca Noel, Charlotte Observer, 28 July 2026
  • The mainly American mainstays monopolize the market, while denim production has tight margins and is resource-intensive.
    — Madeleine Schulz, Vogue, 28 July 2026
Definition of tight
Adjective
  • Out in the wild, turbulent air swirls these plumes into a chaotic, broken landscape—dense chemical filaments laced through long stretches of clean air.
    — Jacek Krywko, ArsTechnica, 1 Aug. 2026
  • This breakthrough could eventually lead to smaller, denser, and more efficient photonic chips for communications, quantum technologies, and optical computing.
    — Rupendra Brahambhatt, Interesting Engineering, 1 Aug. 2026
Definition of dense
Adjective
  • The dishes use simple seasoning like thick Atlantic Salt, olive oil and lemon to enhance instead of masking the ingredients.
    — Connie Ogle July 31, Miami Herald, 31 July 2026
  • Sweltering heat waves, heavy rain and thick wildfire smoke have often made outdoor activities dangerous.
    — Brittney Melton, NPR, 30 July 2026
Definition of thick
Adjective
  • Cuba has struggled to import fuel since the US capture of Venezuelan President Nicolás Maduro in January, Havana’s closest ally.
    — Diego Mendoza, CNN Money, 3 Aug. 2026
  • Punk hit a big clothesline for a close two-count and then went for the GTS.
    — Blake Oestriecher, Forbes.com, 2 Aug. 2026
Definition of close
Adjective
  • At a time when Disney’s once-impenetrable Marvel Cinematic Universe has been exhibiting concerning signs of wear and tear at the box office, Spider-Man is getting more and more powerful.
    — Rebecca Rubin, Variety, 28 July 2026
  • The Phalanx was composed of men who moved and fought as one cohesive unit, creating an impenetrable wall of interlocking shields.
    — Steve Muscato, Forbes.com, 27 July 2026
Definition of impenetrable
Adjective
  • After spending the offseason dedicating himself to succeeding in the weight room, a visibly stronger Richard was an impassable brick wall against the summer league guards.
    — Joseph Dycus, Mercury News, 17 July 2026
  • Officials said numerous rescues were underway across the county as roads became impassable.
    — Ashley Vega, PEOPLE, 17 July 2026
Definition of impassable
Adjective
  • As recidivist would-be escapees, de Boeldieu, Marechal, and Rosenthal are transferred to an impregnable medieval fortress, commanded by Captain von Rauffenstein, now burnt, broken in body, and wearing a neck brace.
    — Thomas Doherty, HollywoodReporter, 18 July 2026
  • Playing on home soil in a venue that has become an almost impregnable fortress, El Tri will face England in the Round of 16 — in what is arguably the most important match in Mexican soccer history.
    — Carlos Rodriguez, Chicago Tribune, 5 July 2026
Definition of impregnable

Browse Nearby Words

impermanent
impermeable
impermissible
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Cite this Entry

“Impermeable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impermeable. Accessed 3 Aug. 2026.

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More from Merriam-Webster on impermeable

Nglish: Translation of impermeable for Spanish Speakers

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