The word "supplely" implies flexibility and ease of movement. Some synonyms for this word include fluidly, gracefully, smoothly, lithely, pliantly, and bendably. Each of these words shares the same connotations as "supplely" but may have slightly different nuances. For example, "fluidly" suggests a more continuous and uninterrupted motion, while "gracefully" implies elegance and finesse. "Pliantly" emphasizes the ability to bend and adapt, while "lithely" emphasizes lightness and agility. Choosing the right synonym for "supplely" can help add variety and specificity to your writing, depending on the context in which it is used.