Noisy and difficult to control.
“School recess is full of obstreperous children running out their energy before settling back in class.”
“The obstreperous bulldog was in need of obedience classes, because he wouldn’t pay attention to anyone.”
“If you’re frustrated at an obstreperous child, try to channel your inner Zen and figure out what they’re protesting.”
Latin, late 16th century
WHY THIS WORD?
There are many nuances in the adjectives used to describe something noisy and drawing attention. “Obstreperous” usually implies a protest; a clamorous sound can’t be ingnored. If you’re boisterous, you’re demonstrating excitement and high spirits. “Vociferous” applies to intense shouting, and something that is chromatic is just colorful.