Boldly resisting authority or an opposing force:
— Brought up to be aggressive and defiant.
— A defiant attitude.

synonym: noncompliant.

Roget 909: threatening, menacing; minatory, minacious^†; comminatory^†, abusive; in terrorem [Lat.]; ominous etc. (predicting) 511; defiant etc. 715; under the ban.    ... show more

Roget 715: defiant; defying etc. v.. with 'with arms akimbo'.   "

Dutch: opstandig