What is another word for insoluble?

Need synonyms for insoluble? Here's a list of words from our thesaurus that you can use instead.

Impossible to solve
“He also found there was no evidence that insoluble problems would be caused for the management of elections if the deposits requirement was not there.”
Incapable of being solved or accomplished
“… the seemingly insoluble mystery concerning the identity of the people who built these ancient structures.”
Not able to be dissolved
“The compound nickel dimethylglyoxime looks like strawberry-pink lipstick, insoluble in water.”
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