'inadvertently-held' originates from the word 'inadvertent,' which comes from Latin, specifically the word 'inadvertentem,' where 'in-' meant 'not' and 'advertentem' meant 'turning the mind to.'

'inadvertentem' transformed into the English word 'inadvertent,' and eventually became the modern English word 'inadvertently-held.'

Initially, it meant 'not turning the mind to,' but over time it evolved into its current meaning of 'unintentionally retained.'