Webster's English Dictionary

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sinuous

sin.u.ous \'sin-y*-w*s\ aj [L sinuosus, fr. sinus] 1a: of a serpentine or 
   wavy form : WINDING  1b: marked by strong lithe movements  2: INTRICATE, 
   COMPLEX  3: SINUATE  - sin.u.ous.ly av