In an obstreperous manner.

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

The quality of being obstreperous.

present participle of obstreperate

To make a loud noise.

Third-person singular simple present indicative form of obstreperate

simple past tense and past participle of obstreperate