Defiantly

[Mark Zuckerberg]

To do something rebelliously; often disobeying authority or some other source of [external] social pressure.

Common mis-spelling of definitely, often [arrived] at when a person types [definatly] or definately into a spell-checker, and the spell-ckecher changes it to defiantly.

[Oralee]

In a manner that shows open resistance or bold disobedience.