/ ɪnˈsɒljəbl; NAmE -ˈsɑːl-/ adjective
1.
( especially BrE ) ( US usually in·sol·vable / ɪnˈsɒlvəbl; NAmE -ˈsɑːl-/) ( of a problem, mystery, etc. ) that cannot be solved or explained
2.
insoluble (in sth) ( of a substance ) that does not dissolve in a liquid
OPP soluble
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WORD ORIGIN
late Middle English : from Old French , or from Latin insolubilis , from in- not + solubilis , from solvere loosen, unfasten.