insolubility n the property (of a problem or difficulty) that makes it impossible to solve n the quality of being insoluble and difficult to dissolve in liquid Usage(s) Rating: insolubility, 95%; interest, 90%; plausibility, 60%; horror, 70%; literary merit, 60%. The war's seeming insolubility brought down the Fourth Republic and enabled Charles de Gaulle to come to power as the one man with sufficient stature to end it. Rating: insolubility, 95%; interest, 90%; plausibility, 60%; horror, 70%; literary merit, 60%. Synonym(s) unsolvability Antonym(s) solvability solubility