DEFIANT

adj. challenging, bold, brazen, audacious, daring; rebellious, disobedient, stubborn, recalcitrant, obstinate, refractory, unyielding, insubordinate, mutinous, unruly, self-willed, aggressive, headstrong, contumacious, pugnacious, hostile, belligerent, antagonistic, Slang gutsy, spunky His defiant attitude towards authority often gets him into trouble