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insoluble

adjective (PROBLEM)
 
 
/ɪnˈsɒl.jʊ.bl̩/ US  /-ˈsɑːl.jə-/ (US also insolvable)

Definition

(of a problem) so difficult that it is impossible to solve: Traffic congestion in large cities seems to be an insoluble problem.Complicated and difficult to doDifficult to understand insolubility
 
 
/ɪnˌsɒl.jʊˈbɪl.ɪ.ti/ US  /-ˌsɑːl.jəˈbɪl.ə.t̬i/ noun [U]
ComplexityDifficult to understandThe state of matter
(Definition of insoluble adjective (PROBLEM) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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