'unexpectedly-found' originates from the combination of 'unexpectedly' and 'found', where 'unexpectedly' is derived from 'unexpected', meaning 'not anticipated', and 'found' is the past participle of 'find', meaning 'to discover'.

'unexpectedly' evolved from the Old English 'un-' meaning 'not' and 'expect', which came from Latin 'expectare', meaning 'to look out for'. 'Found' comes from the Old English 'findan', meaning 'to discover'.

Initially, 'unexpectedly' meant 'not anticipated', and 'found' meant 'discovered'. Together, they convey the idea of something being discovered without prior anticipation.