What is the best definition for the word sinuous?

The term "sinuous" is best defined as having many curves and turns; it often describes something that is gracefully intricate or flexible. The choice that fits this definition is "supple," which emphasizes flexibility and the ability to move easily and gracefully. This is closely aligned with the idea of being sinuous, as both suggest a form that is not rigid or straight.

In contrast, the other options do not capture the essence of "sinuous." "Ominous" relates to something that suggests a threat or bad omen, while "spoiled" refers to something that is decayed or no longer in good condition, and "elaborate" denotes complexity or detail, often without implying the graceful or flowing quality of movement. Therefore, "supple" stands out as the most appropriate synonym for "sinuous."