-p(ə)rəs adjective
Etymology: Latin obstreperus, from obstrepere to make noise against, from ob- to, against + strepere make noise; akin to Old English thræft quarrel, discord, Middle Low German drevelinge vain chatter, Old Norse thrapt chatter; all of imitative origin — more at ob-
1. : marked by or engaging in aggressive noisiness : loud , clamorous
obstreperous roaring
2. : stubbornly defiant : resisting control or restraint often with a show of noisy disorder : turbulent , unmanageable
an obstreperous crew
obstreperous elephants — Faubion Bowers
Synonyms: see vociferous