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, insolubility, insolvable, non-water-soluble, unresolvable, unsoluble, unsolvable, water-insoluble

Antonym: soluble

Encyclopedia: Insoluble

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