'unfound' originates from the prefix 'un-' meaning 'not' and the word 'found' from Old English 'fundian,' meaning 'to find.'

'fundian' transformed into the Middle English word 'founden,' and eventually became the modern English word 'found.'

Initially, 'found' meant 'to discover or locate something,' and 'unfound' has retained the meaning of 'not discovered or located.'