'inadvertently' originates from Latin, specifically the word 'inadvertentem,' where 'in-' meant 'not' and 'advertentem' meant 'turning the mind to.' 'Decide' originates from Latin, specifically the word 'decidere,' where 'de-' meant 'off' and 'caedere' meant 'to cut.'

'inadvertentem' transformed into the French word 'inadvertent,' and eventually became the modern English word 'inadvertent.' 'Decidere' transformed into the French word 'décider,' and eventually became the modern English word 'decide.'

Initially, 'inadvertent' meant 'not turning the mind to,' but over time it evolved into its current meaning of 'unintentional.' 'Decide' initially meant 'to cut off,' but over time it evolved into its current meaning of 'to make a choice.'