Webster's English Dictionary

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insoluble

in.sol.u.ble \(')in-'sa:l-y*-b*l\ \-ble-\ aj [ME insolible, fr. L 
   insolubilis, fr. in- + solvere to]free, dissolve - more at SOLVE : not 
   soluble : as  archaic  : INDISSOLUBLE  : having or admitting of no solution 
   or explanation  : incapable of or only with difficulty being dissolved in a 
   liquid  - insoluble n