ob·strep·er·ous 
(ŏb-strĕpər-əs, əb-)
(ŏb-strĕpər-əs, əb-)adj.
Noisily unruly or defiant: The restaurant owner ejected the obstreperous customer.
[From Latin obstreperus, noisy, from obstrepere, to make a noise against : ob-, against; see OB- + strepere, to make a noise (of imitative origin).]
ob·streper·ous·ly adv.
ob·streper·ous·ness n.