'unresolved' originates from the prefix 'un-' meaning 'not' and the word 'resolve' from Latin 'resolvere', where 're-' meant 'again' and 'solvere' meant 'to loosen or solve'.

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

Initially, 'resolve' meant 'to loosen or solve', and 'unresolved' has maintained the meaning of 'not solved'.