noun
the property (of a problem or difficulty) that makes it impossible to solve
• Syn: ↑insolubility
• Ant: ↑solubility (for: ↑insolubility), ↑solvability
• Derivationally related forms: ↑insoluble (for: ↑insolubility)
• Hypernyms: ↑property
Useful english dictionary. 2012.