insoluble
Americanadjective
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incapable of being dissolved.
insoluble salts.
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incapable of being solved or explained.
an insoluble problem.
adjective
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incapable of being dissolved; incapable of forming a solution, esp in water
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incapable of being solved
Other Word Forms
Etymology
Origin of insoluble
1350–1400; < Latin insolūbilis; replacing Middle English insolible < Middle French insoluble < L. See in- 3, soluble
Explanation
Let a bottle of salad dressing stand on the table for a few hours and you will notice that it has separated into layers. That's because oil is insoluble or is not capable of being dissolved. Insoluble comes from the Latin insolubilis meaning "that cannot be loosened." When a substance is insoluble, it cannot be dissolved or loosened in water. Similarly, a situation that is insoluble has no hope of being solved. When a marriage is beyond repair and cannot be fixed, it is insoluble.
Vocabulary lists containing insoluble
Animal Farm
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"The Fall of the House of Usher" by Edgar Allan Poe
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Stories of Ourselves
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
An insoluble puzzle may be how to give artificial intelligence agents complicated open-ended tasks—tasks that may have many unpredictable paths to a solution—without courting outcomes very much contrary to the intentions of the task giver.
From The Wall Street Journal ● Sep. 18, 2026
Arginine lowered amyloid plaque levels and reduced the amount of insoluble Aβ42 in the brain.
From Science Daily ● May 4, 2026
Purple, savoy and green cabbage are also high in insoluble fiber, which Beitchman says is “the broom of the digestive system,” allowing waste to pass through more easily.
From Salon ● Feb. 21, 2026
In the mouse model, oral arginine lowered amyloid plaque formation and reduced insoluble Aβ42 levels in the brain.
From Science Daily ● Nov. 21, 2025
More than the question of compensation, then, the relocation problem was perilously close to insoluble.
From "Founding Brothers: The Revolutionary Generation" by Joseph J. Ellis
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
