While flying over the Midwest, I saw a long, sinuous river snaking across the plains, winding through fields, farms, and towns as it made its way toward the Gulf of Mexico.—— Merriam-Webster

They were not empty words. Anyone in any doubt that reprisals against the Saudi exile and his Taliban hosts would do anything other than bolster anti-Western Islamic militancy need spend no more than a few minutes in the sinuous bazaars and dusty religious schools of Peshawar. —— Alex Spillius; 'Action Against bin Laden 'Will Start Holy War'; Telegraph; Sept 15, 2001

The sinuous curves of Sarawak’s Salak River wind through coastal mangrove and swamp forests, prime proboscis monkey habitat. Nearby at Bako National Park, I sat in a blind and witnessed a rare sight: a proboscis monkey at eye level, crossing a patch of beach. Caught in mid-stride, this adult male displays the long-limbed grace of a primate well suited to life in the trees. The imposing tail is not used for gripping but may aid in balance as a monkey leaps aloft. —— Tim Laman; Borneo’s Flamboyant Primates; National Geographic; August, 2002

Onscreen Vivien Leigh and Karl Malden make this exchange a funny-painful game of cat and mouse. Give the same words to singers, as Previn and Littell have, and they make the audience squirm, unless the music has a strong character and continuity of its own. Put a tango rhythm under this dialogue, as Kurt Weill might have done, and it can begin to have a musical life that transforms the drama without betraying it. Intensify that tango with a sinuous melody, harmonic twists, and nervous flashes of orchestral color, and the emotions of the scene are ready to take off. Previn, however, uses a technique that in film is called Mickey Mousing, responding to each line with a different rhythm or gesture that mimics the small impulses of the dialogue. This misplaced fidelity to the words renders the music powerless. The audience squirms because there is no reason for the characters to be singing -- and the music prevents them from acting. —— David Schiff; We Want Magic; What makes opera magical in the age of movies?; The Atlantic; Sept 1999

Did you know? (Merriam-Webster)
Although it probably makes you think more of snakes than head colds, "sinuous" is etymologically more like "sinus" than "serpent." "Sinuous" and "sinus" both derive from the Latin noun "sinus," which means "curve, fold, or hollow." In English, "sinus" is the older word; it entered the language in the 1400s, while the earliest recorded use of "sinuous" dates from 1578. "Serpent," by the way, comes from the Latin verb "serpere," meaning "to creep."