Meaning of “insoluble” in the English Dictionary

(Definition of “insoluble” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"insoluble" in American English

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us /ɪnˈsɑl·jə·bəl/

insoluble adjective (DIFFICULT TO SOLVE)

[ not gradable ] (of a problem) so difficult that it is impossible to solve:

Traffic congestion in big cities seems to be an insoluble problem.

insoluble adjective (IMPOSSIBLE TO MIX)

(of a substance) impossible to dissolve:

Sand is insoluble in water.

(Definition of “insoluble” from the Cambridge Academic Content Dictionary © Cambridge University Press)