"Most curvilineal" refers to something that has a lot of curves or follows a curvy path. Some synonyms for this term could be "most meandering," "most winding," "most sinuous," or "most serpentine." These words describe objects or paths that have a lot of twists and turns, often taking an indirect route. Other synonyms could include "most undulating," "most convoluted," or "most labyrinthine," which suggest a more complex or intricate pattern. Overall, synonyms for "most curvilineal" convey the idea of a non-linear and dynamic shape or course, adding depth and interest to the description.