'unexpectedly-lost' originates from the combination of 'unexpectedly' and 'lost'. 'Unexpectedly' comes from 'unexpected', which is derived from Latin 'ex-' meaning 'out of' and 'spectare' meaning 'to look'. 'Lost' comes from Old English 'losian', meaning 'to perish'.

'Unexpectedly' evolved from the Latin 'exspectare', while 'lost' evolved from Old English 'losian'. The combination of these words into 'unexpectedly-lost' is a modern English construct.

Initially, 'unexpectedly' meant 'not expected', and 'lost' meant 'perished'. Together, they now describe something that has become lost in an unforeseen manner.