From King Dictionary of Contemporary Englishdefiantde‧fi‧ant /dɪˈfaɪənt/ adjective DISOBEYclearly refusing to do what someone tells you to do Mark smashed a fist on the desk in a defiant gesture.defiantly adverb
Examples from the Corpus
defiantHer reply was clear and defiant.The building oozed a melancholy yet defiant air, cornered by an unforgiving landscape with which it refused to make any compromises.It is easier to be soothing with a highly sensitive child who is clingy and frightened than with a defiant child.Many defiant children are also unusually clever; figuring out ways to defeat your most sophisticated arguments.Some defiant children are very shy.The big bird squatted quietly against Rima's chest, but her eyes held a sulky, defiant glare."Nothing is going to change, " said a defiant Miller after his trial.Demonstrators became increasingly defiant of police controls.He is one of the defiant ones.Defiant party members openly challenged the leadership.But it was a defiant rather than a triumphant gesture.No, he said - and he was defiant - there was no need.
Origin defiant (1500-1600) French défiant, present participle of défier; DEFY