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.