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
Meanwhile, insoluble fiber bulks up your stool and keeps you regular, Schiff says.
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Kirsten Nunez, Martha Stewart, 30 Dec. 2025
Brown rice contains more insoluble fiber from the bran layer, which can be great for promoting regular bowel movements and supporting overall gut health.
—Lauren Panoff, Verywell Health, 9 Dec. 2025
There are two main kinds of fiber—insoluble and soluble fiber.
—Mark Gurarie, Health, 5 Dec. 2025
There are two main types of dietary fiber—soluble and insoluble—and many foods contain a combo of the two.
—Danielle Zickl, SELF, 27 Nov. 2025
See All Example Sentences for insoluble
Recent Examples of Synonyms for insoluble
Adjective
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While Houston’s rally wasn’t quite as explosive, the Texans pulled off what once seemed impossible.—
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There are great catches and there are impossible catches.—
Adjective
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The Knights could only manage a hopeless heave from well beyond halfcourt at the buzzer.—
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Produced by Feingold’s Romantical and distributed by Level33, the film follows Leo Kadner (Feingold), a hopeless romantic New Yorker who reconnects with his childhood crush Eva Shapiro (Sarah Coffey) while preparing for his 31-year-old Bar Mitzvah.—
Cite this Entry
“Insoluble.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insoluble. Accessed 13 Jan. 2026.
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