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Adjective: insoluble  in'sól-yu-bul
  1. (of a substance) incapable of being dissolved
    - indissoluble
  2. Admitting of no solution or explanation
    "an insoluble doubt"
  3. Without hope of solution
    "an insoluble problem"

See also: hopeless, incomprehensible, inexplicable, insolvable, non-water-soluble, unresolvable, unsoluble, unsolvable, water-insoluble

Antonym: soluble

Encyclopedia: Insoluble