obstreperous (adj.)

"clamorous, noisy, boisterous, especially in opposition," c. 1600, from Latin obstreperus "clamorous," from obstrepere "drown with noise, make a noise against, oppose noisily," from ob "against" (see ob-) + strepere "make a noise," from PIE *strep-, said to be imitative (compare Latin stertare "to snore," Old Norse þrefa "to quarrel," þrapt "chattering, gossip," Old English þræft "quarrel"). But de Vaan writes, "It is uncertain that *strep- goes back to PIE, since it is only found in Latin and Germanic." Extended sense of "resisting control, management, or advice" is by 1650s. Related: Obstreperously; obstreperousness.

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