impermeable
adjective
im·per·me·able
(ˌ)im-ˈpər-mē-ə-bəl 
: not permitting passage (as of a fluid) through its substance
broadly
: impervious
Examples of impermeable in a Sentence
an impermeable layer of rock
a fabric impermeable to moisture
Recent Examples on the Web
The company says the finalized Bio foil provides the full and appropriate level of impermeable barrier protection and odorless performance.
—
New Atlas, 9 Oct. 2025
Chocolate brown stripes punctuate a light charcoal gray background, and the low-pile weave made from recycled polyester gives it an impermeable, easy-to-clean surface.
—Julia Harrison, Architectural Digest, 6 Oct. 2025
Typically, these formations have porous rock layers overlaid by impermeable rock that blocks upward movement.
—Tejasri Gururaj, Interesting Engineering, 3 Oct. 2025
Which means the bigger the economy, the greater the means to erect an impermeable national defense system.
—John Tamny, Forbes.com, 12 Sep. 2025
See All Example Sentences for impermeable
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New Atlas, 9 Oct. 2025
Chocolate brown stripes punctuate a light charcoal gray background, and the low-pile weave made from recycled polyester gives it an impermeable, easy-to-clean surface.
—Julia Harrison, Architectural Digest, 6 Oct. 2025
Typically, these formations have porous rock layers overlaid by impermeable rock that blocks upward movement.
—Tejasri Gururaj, Interesting Engineering, 3 Oct. 2025
Which means the bigger the economy, the greater the means to erect an impermeable national defense system.
—John Tamny, Forbes.com, 12 Sep. 2025
See All Example Sentences for impermeable
Cite this Entry
“Impermeable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impermeable. Accessed 31 Oct. 2025.
Copy CitationKids Definition
impermeable
adjective
im·per·me·able
(ˈ)im-ˈpər-mē-ə-bəl
: not permitting passage (as of a fluid) through the material of which it is made
Medical Definition
impermeable
adjective
im·per·me·able
(ˈ)im-ˈpər-mē-ə-bəl
: not permitting passage (as of a fluid) through its substance
the plasma membrane of a red blood cell is relatively impermeable to sodium and calcium ions
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