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

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

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.

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

For the uninitiated, Horses was one of those buzzy, impossible-to-get-into, celebrity-magnet restaurants in LA.

— Sam Stone, Bon Appetit Magazine, 27 Mar. 2026
The results show that reproduction could pose a real challenge for future space settlers, but it still can’t be ruled out as impossible.

— Chris Young, Interesting Engineering, 27 Mar. 2026