Ob·strep'er·ous adjective [ Latin 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. ' Found on http://www.encyclo.co.uk/webster/O/6