Synonyms of the word

obstreperous

• adj. Attended by, or making, a loud and tumultuous noise; boisterous.
• adj. Stubbornly defiant; disobedient; resistant to authority or control, whether in a noisy manner or not.

aggressive

• adj. Tending or disposed to aggress; characterized by aggression; making assaults; unjustly attacking.
• adj. (programming) Of code optimization techniques: exploiting every opportunity to be applied.

defiant

• adj. defying.
• adj. Boldly resisting opposition.

noncompliant

• adj. Not compliant; rebellious.
• n. One who fails to comply, for example with a law.