Webster's English Dictionary

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obstreperous

Cross references:
  1. vociferous            
 
ob.strep.er.ous \*b-'strep-(*-)r*s, a:b-\ aj [L obstreperus, fr. obstrepere 
   to clamor against, fr. ob- aga]inst + strepere to make noise; akin to OE 
   thrft discord - more at OB- 1: uncontrollably noisy : CLAMOROUS  2: 
   stubbornly defiant : UNRULY  - ob.strep.er.ous.ly av