adj – Attended by, or making, a loud and tumultuous noise; boisterous, noisy.
OR Stubbornly defiant; disobedient; resistant to authority or control, whether in a noisy manner or not.
“The football fans were obstreperous throughout the championship game.”
(We would also like to note that our aural pronunciations are present within our MP3 files at the bottom of each word. :))