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
The flesh of the apple has soluble fiber, while the skin has insoluble fiber.
—
Mara Santilli, SELF, 27 June 2025
Soluble fiber, like the kind found in fruit and vegetables, dissolves in water to form a gel, while insoluble fiber—which comes from sources like grains—doesn’t dissolve.
—Perri Ormont Blumberg, Time, 5 June 2025
Other fiber types, including insoluble fiber like wheat bran, do not provide these health benefits.1 Consider these benefits when choosing the right fiber supplement to meet your overall health needs.
—T'keyah Bazin, Verywell Health, 4 June 2025
Good sources of insoluble fiber include raspberries, pears, apricots, figs, and prunes, which are known for promoting regularity.14
4.
—Lauren O'Connor, Health, 3 June 2025
See All Example Sentences for insoluble
Mara Santilli, SELF, 27 June 2025
Soluble fiber, like the kind found in fruit and vegetables, dissolves in water to form a gel, while insoluble fiber—which comes from sources like grains—doesn’t dissolve.
—Perri Ormont Blumberg, Time, 5 June 2025
Other fiber types, including insoluble fiber like wheat bran, do not provide these health benefits.1 Consider these benefits when choosing the right fiber supplement to meet your overall health needs.
—T'keyah Bazin, Verywell Health, 4 June 2025
Good sources of insoluble fiber include raspberries, pears, apricots, figs, and prunes, which are known for promoting regularity.14
4.
—Lauren O'Connor, Health, 3 June 2025
See All Example Sentences for insoluble
Recent Examples of Synonyms for insoluble
Adjective
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No sign yet of the Qualcomm fixes from last month which triggered a U.S. government update mandate for federal staff, with a deadline that was impossible to hit.—
Zak Doffman,
Forbes.com,
8 July 2025
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Nowadays, both men and women are serving faster than ever before, with players regularly reaching service speeds that were once thought to be nearly impossible.—
Ben Church,
CNN Money,
8 July 2025
Adjective
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In a time when the suffering and seemingly hopeless prospects of America’s poor are known to all who have eyes to see, the only fig leaf available to hide the obscenity of this bill is the old partisan charge of waste, fraud and abuse.—
Clarence Page,
Chicago Tribune,
6 July 2025
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Valentine, Texas, stamps 10,000+ love letters each year For more than three decades, the small-town Valentine Post Office — also known as the Love Station — has processed thousands of love letters from hopeless romantics around the world.—
Brandi D. Addison,
Austin American Statesman,
2 July 2025
Cite this Entry
“Insoluble.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insoluble. Accessed 21 Jul. 2025.
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