Definition of insoluble adjective from the Oxford Advanced American Dictionary

     

    insoluble

     adjective
    adjective
    NAmE//ɪnˈsɑlyəbl//
     
     
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  1. 1 (of a problem, mystery, etc.) that cannot be solved or explained
  2. 2 insoluble (in something) (of a substance) that does not dissolve in a liquid opposite soluble
See the Oxford Advanced Learner's Dictionary entry: insoluble