insoluble
Americanadjective
-
incapable of being dissolved.
insoluble salts.
-
incapable of being solved or explained.
an insoluble problem.
adjective
-
incapable of being dissolved; incapable of forming a solution, esp in water
-
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
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
"The Fall of the House of Usher" by Edgar Allan Poe
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Stories of Ourselves
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
After the ghostly reflection of Frank Silva, a prop man, was inadvertently caught on camera, Lynch was inspired and cast Silva as the embodiment of insoluble evil.
From The Wall Street Journal • Apr. 17, 2026
For example, if your daily goal is 30 grams of fiber, about 20 grams should come from insoluble fiber and 10 grams from soluble fiber.
From Science Daily • Mar. 8, 2026
Soluble fiber dissolves in water and slows digestion, while insoluble fiber helps move waste through the digestive tract.
From Science Daily • Mar. 8, 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
“Crack Stress of Airplane Bodies by Computer Analysis” — he was looking for a numerical solution to analytically insoluble equations.
From "Typical American" by Gish Jen
Definitions 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.
