Obstreperous

Ob*strep"er*ous (?), a. [L. obstreperus, from obstrepere to make a noise at; ob (see Ob-) + strepere to make a noise.] 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.