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Definitions

insoluble

[in-sol-yuh-buhl] / ɪnˈsɒl yə bəl /
ADJECTIVE
mysterious, unable to be solved or answered
Synonyms
WEAK
baffling difficult impenetrable indecipherable inexplicable inextricable irresolvable mystifying obscure unaccountable unconcluded unfathomable unresolved unsolvable unsolved
Antonyms
WEAK
explainable explicable obvious open solvable

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.

To maintain a healthy balance, Lee recommends consuming roughly twice as much insoluble fiber as soluble fiber each day.

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

But if a problem is insoluble, it’s not a problem anymore; it’s just the way things are.

From Salon • Dec. 31, 2024

While insoluble fibers work well in breads, there are many other types of products where this isn't the case.

From Science Daily • Nov. 20, 2024

“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