INSOLUBLE Synonyms: 70 Similar and Opposite Words

insoluble

adjective

(ˌ)in-ˈsäl-yə-bəl

Definition of insoluble

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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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 Both minerals bind together in the digestive tract to form insoluble calcium oxalate, which naturally prevents the body from absorbing essential calcium. — Ayesha Gulzar, Verywell Health, 18 Aug. 2026 Fiber, including both soluble and insoluble fiber, play critical roles in gut health. — Jillian Kubala, HEALTH, 4 Aug. 2026 The seeds hold most of the insoluble fiber, and the skin adds even more, according to Martorano. — Olivia McIntosh, Martha Stewart, 22 July 2026 Many popular houseplants contain insoluble calcium oxalate crystals, tiny needle-like structures found in their leaves and stems. — Ryan Brennan, Fort Worth Star-Telegram, 14 July 2026 See All Example Sentences for insoluble

Recent Examples of Synonyms for insoluble

Adjective

Elwood told his boss – Peter Brown, a former member of the Beatles’ inner circle and the founder of Brown Lloyd James – that the assignment was impossible.

— Rob Picheta, CNN Money, 30 Aug. 2026
Such components can benefit from additive manufacturing because the technology lets engineers create geometries that would be difficult or impossible to produce with traditional manufacturing methods.

— Kaif Shaikh, Interesting Engineering, 29 Aug. 2026

Definition of impossible

Adjective

This latest attempt to move, a hopeless punt to have his contract annulled in order to leave on a free sooner, will likely see anger return at Selhurst Park on Friday night against Manchester City.

— Matt Woosnam, New York Times, 25 Aug. 2026
Ever the hopeless romantic, Ted searches for the love of his life through a constant series of twists, turns, diversions, blue French horns, slap bets, and yellow umbrellas.

— Skyler Trepel, Entertainment Weekly, 20 Aug. 2026

Definition of hopeless

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insolents

insoluble

insolvable

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“Insoluble.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insoluble. Accessed 2 Sep. 2026.

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Synonyms of insoluble

adjective

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