'unresolvable' originates from the prefix 'un-' meaning 'not' and the word 'resolvable' which comes from Latin 'resolvĕre', meaning 'to loosen or release'.

'resolvĕre' transformed into the Old French word 'resolver', and eventually became the modern English word 'resolve'. The prefix 'un-' was added to form 'unresolvable'.

Initially, 'resolvĕre' meant 'to loosen or release', but over time, 'resolve' evolved to mean 'to find a solution'. 'Unresolvable' thus means 'not able to find a solution'.