as in impossible
incapable of being solved or accomplished
the seemingly insoluble mystery concerning the identity of the people who built these ancient structures
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Recent Examples of insoluble
Each serving can have up to 6 grams of insoluble fiber (double that of regular wheat pasta).
—
Bestreviews, Mercury News, 23 Jan. 2026
The main ingredient — chickpeas — is a nutritional powerhouse that provides protein along with both soluble and insoluble fibers, making a serving (or two) excellent for gut health.
—Gretchen McKay, Twin Cities, 15 Jan. 2026
Dietitians say the fruit's sweet pulp and tiny seeds provide both soluble and insoluble fiber, helping improve regularity while also supplying antioxidants and key minerals that support overall health.
—Deirdre Bardolf, FOXNews.com, 3 Jan. 2026
There are two main types of fiber: soluble and insoluble.
—Daryl Austin, USA Today, 1 Dec. 2025
See All Example Sentences for insoluble
Bestreviews, Mercury News, 23 Jan. 2026
The main ingredient — chickpeas — is a nutritional powerhouse that provides protein along with both soluble and insoluble fibers, making a serving (or two) excellent for gut health.
—Gretchen McKay, Twin Cities, 15 Jan. 2026
Dietitians say the fruit's sweet pulp and tiny seeds provide both soluble and insoluble fiber, helping improve regularity while also supplying antioxidants and key minerals that support overall health.
—Deirdre Bardolf, FOXNews.com, 3 Jan. 2026
There are two main types of fiber: soluble and insoluble.
—Daryl Austin, USA Today, 1 Dec. 2025
See All Example Sentences for insoluble
Recent Examples of Synonyms for insoluble
Adjective
-
When the sun moves away from the node, the season ends, and eclipses become impossible again.—
Jamie Carter,
Space.com,
13 Feb. 2026
-
Word of mouth slowly led to the first Superblast being impossible to find after its introduction in 2022, and consumer appetite was fed with slight updates and greater stock on the Superblast 2 two years later.—
Ian Servantes,
Footwear News,
13 Feb. 2026
Adjective
-
From what looked like a hopeless position just a few weeks ago, the subscribers are now off the bottom of the table and gearing up for a potential title challenge.—
Oliver Kay,
New York Times,
30 Jan. 2026
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And if the hypotheticals are not enough to dissuade, history is littered with teams trading away their future for immediate glories, seeing their plans implode, and being left with a ruinous future that becomes a hopeless present while another team reaps the benefits.—
Joseph Dycus,
Mercury News,
30 Jan. 2026
Cite this Entry
“Insoluble.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insoluble. Accessed 18 Feb. 2026.
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