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

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 Both soluble and insoluble fiber are important for gut health. — Jackie Flynn Mogensen, Scientific American, 5 Oct. 2026 Plums contain both soluble and insoluble fiber, but soluble fiber may be especially helpful for cholesterol. — Kathleen Ferraro, Verywell Health, 4 Oct. 2026 Apples also contain multiple types of fiber, including soluble fiber (which promotes healthy cholesterol levels) and insoluble fiber (which benefits digestion), says Elick. — Kirsten Nunez, Martha Stewart, 31 Aug. 2026 Fiber, including both soluble and insoluble fiber, play critical roles in gut health. — Jillian Kubala, HEALTH, 4 Aug. 2026 See All Example Sentences for insoluble

Recent Examples of Synonyms for insoluble

Adjective

Well, not necessarily unhittable, but impossible to score runs against.

— Ian Miller OutKick, FOXNews.com, 18 Oct. 2026
The documentary contains, through her participation and performance, the accommodation that facts alone are insufficient and maybe impossible.

— Jackson McHenry, Vulture, 17 Oct. 2026

Definition of impossible

Adjective

Pettus said watching Patterson's progress and seeing her family in a home of their own has been especially meaningful after a period that once seemed hopeless.

— Jennifer Bisram, CBS News, 14 Oct. 2026
Approximately 18% of all Latino high school students have seriously contemplated suicide and 42% of Latino youths reported constantly feeling sad or hopeless, recent congressional studies found.

— Carlos De Loera, Los Angeles Times, 9 Oct. 2026

Definition of hopeless

Browse Nearby Words

insolents

insoluble

insolvable

See all Nearby Words

Cite this Entry

Style

“Insoluble.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/insoluble. Accessed 21 Oct. 2026.

Copy Citation

Synonyms of insoluble

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

jilt

Popular in Grammar & Usage

Merriam-Webster’s Great Big List of Words You Love to Hate

'Can' vs. 'May'

'Affect' vs. 'Effect'

More Commonly Mispronounced Words

Is it 'nerve-racking' or 'nerve-wracking'?

Popular in Wordplay

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Did 'orange' the fruit or the color come first?

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

Merriam-Webster’s Great Big List of Words You Love to Hate

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Games & Quizzes