1. 吵闹的；喧闹的；难以管束的;桀骜不驯的
    If you say that someone is obstreperous, you think that they are noisy and difficult to control.

1. boisterously and noisily aggressive

    e.g. kept up an obstreperous clamor

2. noisily and stubbornly defiant

    e.g. obstreperous boys