1
as in dense
impossible to get through or into
the ancient temple was surrounded by vast stretches of impenetrable jungle
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Antonyms & Near Antonyms
2
as in mysterious
being beyond one's powers to know, understand, or explain
the mysteries of that religion are completely impenetrable to outsiders
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3
as in incomprehensible
impossible to understand
the textbook's language is completely impenetrable, at least to me
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4
as in tight
not allowing penetration (as by gas, liquid, or light)
the container of toxic waste has an impenetrable seal to prevent leaks
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Example Sentences
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Recent Examples of impenetrable
Courtside, before a battle, Osaka’s deep colorways and the many translucent but somehow impenetrable layers of the vast floor-dragging skirt work as armor inspiring stone-cold dread in all prospective opponents.
—
Guy Martin,
Forbes.com,
1 June 2026
The starting back three of captain Tim Ream, Mark McKenzie and Freeman were not exactly impenetrable.
—
Kyle Feldscher,
CNN Money,
31 May 2026
Rake grounds into the upper soil layer to avoid creating an impenetrable mat on the soil surface.
—
Kim Toscano,
Southern Living,
31 May 2026
The Thunder’s perimeter defense sometimes feels impenetrable and is anchored on the back line by Chet Holmgren, one of the best rim protectors in basketball.
—
James L. Edwards Iii,
New York Times,
27 May 2026
See All Example Sentences for impenetrable
Guy Martin,
Forbes.com,
1 June 2026
The starting back three of captain Tim Ream, Mark McKenzie and Freeman were not exactly impenetrable.
—
Kyle Feldscher,
CNN Money,
31 May 2026
Rake grounds into the upper soil layer to avoid creating an impenetrable mat on the soil surface.
—
Kim Toscano,
Southern Living,
31 May 2026
The Thunder’s perimeter defense sometimes feels impenetrable and is anchored on the back line by Chet Holmgren, one of the best rim protectors in basketball.
—
James L. Edwards Iii,
New York Times,
27 May 2026
See All Example Sentences for impenetrable
Recent Examples of Synonyms for impenetrable
Adjective
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More memory, denser racks, faster deployment The new server promises 50 percent more memory per socket and more GPU memory compared to the previous generation.
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For ultimate comfort, the loveseat and chairs also include dense foam cushions wrapped in smooth polyester.
Adjective
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Translation is a very mysterious thing because my goal is to create something that’s deeply equivalent but uses zero of the same words.
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That is until their husbands are killed under mysterious circumstances in the USSR, and the pair become CIA operatives.
Adjective
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To make a lunge like that, with his studs up, seemed incomprehensible, never mind dangerous.
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That principle has crumbled so far in the face of Wembanyama’s combination of incomprehensible on-court abilities, youthful enthusiasm and cosmopolitan-unto-eccentric savoir faire.
Adjective
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Contrary to what those face-washing commercials from our childhood led us to believe, your skin doesn't need to feel tight or squeaky-clean after cleansing.
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That was a fantastic finish into a tight window.
Adjective
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Very much on the plus side, the output can't smudge, doesn't scratch easily, is almost impossible to tear, and is virtually impervious to water, so high scores for survivability.
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Waterproof materials are impervious to water, providing a complete barrier, while water-resistant materials only resist water penetration to a certain degree before the water seeps through.
Adjective
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Bunnie Xo has shared a cryptic video on social media after news of her split from Jelly Roll surfaced.
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Jelly Roll is clarifying a cryptic post that's going viral amid his divorce from Bunnie Xo.
Adjective
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The world premiere on Sunday – in the presence of Illumination boss Chris Meledandri and director Pierre Coffin, who is also the origin of the minions’ unintelligible chatter – kicks off one of the biggest Annecy Film Festival’s yet.
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The adversaries made for a striking scene, exchanging insults in mutually unintelligible languages in the dead of night.
Adjective
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Engineers eventually replaced them with a version made up of 20 impermeable compartments of high-pressure hoses containing water.
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Dry waterproofing technology, which is basically like an invisible, impermeable sock liner.
Cite this Entry
“Impenetrable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/impenetrable. Accessed 26 Jun. 2026.
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