'inadvertently' originates from Latin, specifically the word 'inadvertentem,' where 'in-' meant 'not' and 'advertentem' meant 'turning the mind to.' 'maintained' comes from Old French 'maintenir,' where 'main' meant 'hand' and 'tenir' meant 'to hold.'

'inadvertentem' transformed into the English word 'inadvertent,' and 'maintenir' became 'maintain' in Middle English.

Initially, 'inadvertent' meant 'not turning the mind to,' but over time it evolved into its current meaning of 'unintentional.' 'Maintain' has largely retained its original meaning of 'to keep in a certain state.'