'insolubility' originates from Latin, specifically the word 'insolubilitas', where 'in-' meant 'not' and 'solubilis' meant 'able to be loosened or dissolved'.

'insolubilitas' transformed into the Old French word 'insolubilité', and eventually became the modern English word 'insolubility'.

Initially, it meant 'not able to be dissolved', and this meaning has largely remained the same in modern usage.