LATIN DICTIONARYLexicon Latīnum
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“insoluble” in Latin

The English word insoluble itself goes back to Latin solūbilis, through insolūbilis.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

insoluble
by circumlocution with liquefieri (liquari, resolvi, discuti) non posse. SYN. of verbs in MELT.

Quick answer

What is the Latin word for insoluble?
The usual Latin words for “insoluble” are liquefaciō, liquō, resolvō; also discutiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.