Use 'inadvertence' when someone unintentionally overlooks important details, not on purpose. Due to his inadvertence, he missed the disclaimer at the bottom of the page.
Pro Tip 2/3
Unintended Consequences
It often implies that a lack of attention has led to a negative outcome or mistake. Her inadvertence in studying the instructions led to a failed science experiment.
Pro Tip 3/3
Not Always Serious
'Inadvertence' can refer to minor absent-minded acts, not just serious errors. His inadvertence made him forget his keys at home.