Here's a breakdown:
* Noisily: Loud and making a lot of sound.
* Stubbornly defiant: Resistant to control and unwilling to obey.
* Unruly: Difficult to control or manage.
In simpler terms: Think of someone who is loud, boisterous, and refuses to listen or behave.
Examples:
* "The children were so obstreperous that the teacher had to send them to the principal's office."
* "The crowd became obstreperous when their team lost the game."
* "The obstreperous dog barked and howled all night."
Synonyms: Rowdy, boisterous, unruly, defiant, rebellious.
Antonyms: Quiet, docile, obedient, submissive.