INSOLUBLE Synonyms: 70 Similar and Opposite Words

insoluble

adjective

(ˌ)in-ˈsäl-yə-bəl

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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Example Sentences

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Recent Examples of insoluble 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 Shawn and Gregory have been grappling with the insoluble problem of just how much of one’s life one can or even should be fully alive to for half a century. —

Sara Holdren, Vulture, 6 Mar. 2026 Why Fiberlayering Is Better Than Fibermaxxing Fiber is often grouped as soluble, insoluble, and resistant starch. —

Kathleen Ferraro, Verywell Health, 5 Mar. 2026 Constipation and Digestion Issues There are two types of fiber, soluble and insoluble, and both play important roles in regular bowel movements, says Laurie Allen, RDN, LDN, professor of nutrition and director of didactic program in dietetics nutrition at UNC Greensboro. —

Kirsten Nunez, Martha Stewart, 25 Feb. 2026 See All Example Sentences for insoluble

Recent Examples of Synonyms for insoluble

Adjective

Desire defines the work and is impossible to divorce from our response to it.

— Vince Aletti, New Yorker, 17 Apr. 2026
Previously, the idea of a pope from the US was deemed impossible because the cardinals would not want to ally the Church with the world’s dominant power.

— Christopher Lamb, CNN Money, 17 Apr. 2026