Another word for insoluble

insoluble
Synonyms
insoluble
modif.
insolvable, unsolvable, unconcluded, unresolved, unsolved, inexplicable, mysterious, baffling; see also difficult 2.
WEBSTER’S NEW WORLD® ROGET’S A-Z THESAURUS by Charlton Laird and the editors of Webster’s New World dictionaries. Copyright © 1999 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"insoluble." YourDictionary, n.d. Web. 17 January 2019. <https://thesaurus.yourdictionary.com/insoluble>.
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insoluble. (n.d.). Retrieved January 17th, 2019, from https://thesaurus.yourdictionary.com/insoluble