'inadvertently-kept' originates from the combination of 'inadvertently' and 'kept'. 'Inadvertently' comes from Latin, specifically the word 'inadvertentem', where 'in-' meant 'not' and 'advertentem' meant 'turning the mind to'. 'Kept' is the past participle of 'keep', which comes from Old English 'cēpan', meaning 'to seize, hold'.

'inadvertently' changed from the Latin word 'inadvertentem' and eventually became the modern English word 'inadvertently'. 'Kept' evolved from the Old English 'cēpan' to the modern English 'keep', with 'kept' as its past participle.

Initially, 'inadvertently' meant 'not turning the mind to', but over time it evolved into its current meaning of 'unintentionally'. 'Kept' has largely retained its original meaning of 'held or retained'.