in a way that proudly refuses to obey authority

A group of prisoners stood on the roof, defiantly waving banners. 一群囚犯站在屋顶上，挥舞横幅以示对抗。

They defiantly refused to identify themselves in court. 他们拒绝在法庭上表明身份，以示对抗。

in a way that shows you are not willing to accept criticism or disapproval

He defiantly denies having done anything wrong. 他坚决否认自己做了任何错事。

She defiantly declared her innocence and claimed that prosecutors are trying to destroy her. 她坚称自己无罪，并声称是检察官们要毁了她。