Defiant
Defiant (adj) /dɪˈfaɪ.ənt/
intentionally disobedient – aggressively challenging, insubordinate, deliberately disobeying, insolent, cheeky, rebellious
The student left the principal’s room, slamming the door behind in a defiant gesture.
Antonym: compliant
Verb: defy
Noun: defiance
Adverb: defiantly