Webster's English Dictionary

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tumultuous

tu.mul.tu.ous \t(y)u.-'m*lch-(*-)w*s, -'m*l-ch*s\ aj 1: marked by tumult  
   2: tending or disposed to cause or incite a tumult  3: marked by violent or 
   overwhelming turbulence or upheaval  - tu.mul.tu.ous.ly av