Source : Webster's Revised Unabridged Dictionary (1913)

Sinuous \Sin"u*ous\, a. [L. sinuosus, fr. sinus a bent surface,
   a curve: cf. F. sinueux. See {Sinus}.]
   Bending in and out; of a serpentine or undulating form;
   winding; crooked. -- {Sin"u*ous*ly}, adv.

         Streaking the ground with sinuous trace. --Milton.

         Gardens bright with sinuous rills.       --Coleridge.

Source : WordNet®

sinuous
     adj : curved or curving in and out; "wiggly lines" [syn: {sinuate},
            {wiggly}]