insoluble
adjective
in·sol·u·ble
(ˌ)in-ˈsäl-yə-bəl 
: not soluble: such as
a
: incapable of being dissolved in a liquid and especially water
also
: soluble only with difficulty or to a slight degree
b
: having or admitting of no solution or explanation
an insoluble problem
c
archaic
: indissoluble
insoluble
noun
Examples of insoluble in a Sentence
a substance insoluble in water
the seemingly insoluble mystery concerning the identity of the people who built these ancient structures
Recent Examples on the Web
Plus, during processing, many commercial whole-grain breads have their natural insoluble fibers extracted and replaced with a soluble fiber such as inulin, Bruce Hamaker, a professor of food science at Purdue University, told me.
—
Trisha Pasricha, The Atlantic, 7 Apr. 2026
These distinctions are useful to understand fiber’s benefits, but practically speaking, any whole plant food will offer a mix of soluble and insoluble fibers, packing all of the related health payoffs.
—Matt Fuchs, Time, 25 Mar. 2026
Soluble fiber dissolves in water and forms a gel, while insoluble fiber helps waste move through the intestines.
—Sarah Garone, Health, 16 Mar. 2026
Prunes offer both soluble and insoluble fiber, proving especially helpful for the regularity challenges that often come with GLP-1s.
—Lauren Manaker, SELF, 10 Mar. 2026
See All Example Sentences for insoluble
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.
Trisha Pasricha, The Atlantic, 7 Apr. 2026
These distinctions are useful to understand fiber’s benefits, but practically speaking, any whole plant food will offer a mix of soluble and insoluble fibers, packing all of the related health payoffs.
—Matt Fuchs, Time, 25 Mar. 2026
Soluble fiber dissolves in water and forms a gel, while insoluble fiber helps waste move through the intestines.
—Sarah Garone, Health, 16 Mar. 2026
Prunes offer both soluble and insoluble fiber, proving especially helpful for the regularity challenges that often come with GLP-1s.
—Lauren Manaker, SELF, 10 Mar. 2026
See All Example Sentences for insoluble
Cite this Entry
“Insoluble.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insoluble. Accessed 12 Apr. 2026.
Copy CitationKids Definition
insoluble
adjective
in·sol·u·ble
(ˈ)in-ˈsäl-yə-bəl
1
: impossible to solve
an insoluble problem
2
: impossible or difficult to dissolve
a substance insoluble in water
Medical Definition
insoluble
adjective
in·sol·u·ble
(ˈ)in-ˈsäl-yə-bəl
: incapable of being dissolved in a liquid
also
: soluble only with difficulty or to a slight degree
Love words? Need even more definitions?
Merriam-Webster unabridged
