Synonyms of insoluble

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

• impossible
• hopeless
• problematical
• unlikely
• problematic
• insolvable
• unsolvable
• insuperable
• futile
• unattainable
• impractical
• unrealizable
• undoable
• useless
• incredible
• unworkable
• impracticable
• absurd
• unusable
• questionable
• infeasible
• dubious
• improbable
• suspect
• inconceivable
• debatable
• unfeasible
• disputable
• suspicious
• implausible
• fishy
• unthinkable
• fantastical
• shaky
• unimaginable
• unbelievable
• doubtful
• ridiculous
• far-fetched
• doubtable
• outlandish
• shady
• preposterous
• fantastic

Antonyms & Near Antonyms

• soluble
• possible
• feasible
• workable
• practical
• achievable
• attainable
• useful
• applicable
• functional
• reasonable
• usable
• resolvable
• practicable
• working
• probable
• realizable
• serviceable
• likely
• doable
• useable
• acceptable
• plausible
• conceivable
• credible
• believable

Example Sentences

Recent Examples of insoluble

While high-fiber foods can help with regularity and constipation, insoluble fiber—found in the outer skin of plant foods such as whole grains, nuts, and seeds—may cause more bloating and gas. —Johna Burdeos, Health, 21 Jan. 2025

Soluble fiber slows digestion to allow for better absorption of nutrients, while insoluble fiber adds bulk to the stool, which helps prevent constipation. —Sarah Scott, Verywell Health, 22 Oct. 2024

Bacteria in the gut do not ferment (break down) insoluble fiber.1 Soluble fiber ferments in the gut, which releases helpful by-products such as short-chain fatty acids (SCFAs).1 SCFAs have health-promoting effects, including fighting inflammation and supporting the immune system.2 1. —Johna Burdeos, Health, 4 Dec. 2024

Yet the dilemmas posed by partition long predate 1967 and stem from a fundamentally insoluble problem. —Yousef Munayyer, Foreign Affairs, 15 Oct. 2019