attainableness 14 Associations

achievability attainability possibility (generic term) possibleness (generic term)

conceivableness 15 Associations

conceivability possibility (generic term) possibleness (generic term)

impossibility 13 Associations

impossibleness nonexistence (generic term) nonentity (generic term) possibility (antonym)

inconceivableness 17 Associations

inconceivability impossibility (generic term) impossibleness (generic term)