Ob·strep·er·ous a.
1. Attended by, or making, a loud and tumultuous noise; clamorous; noisy; vociferous. “The obstreperous city.” --Wordsworth. “Obstreperous approbation.” --Addison.
Beating the air with their obstreperous beaks. --B. Jonson.
-- Ob*strep*er*ous*ly, adv. -- Ob*strep*er*ous*ness, n.
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obstreperousness
n : noisy defiance