'unrecovered' originates from the prefix 'un-' meaning 'not' and the verb 'recover' from Latin 'recuperare', where 're-' meant 'again' and 'cuperare' meant 'to gain'.

'recuperare' transformed into the Old French word 'recovrer', and eventually became the modern English word 'recover'. The prefix 'un-' was added to form 'unrecovered'.

Initially, 'recover' meant 'to regain possession', but over time it evolved into its current meaning of 'to return to a normal state'.