Which word best describes a situation that is chaotic and tumultuous?

The term "turmoil" best captures a situation that is chaotic and tumultuous. It conveys a strong sense of confusion, upheaval, and disorder, which aligns with the characteristics of chaos and tumult. When a situation is described as being in turmoil, it typically involves emotional or physical disturbance, where normal operations are disrupted, leading to a sense of unpredictability and instability.

In contrast, "tranquil" suggests calmness and peace, which directly opposes the idea of chaos. "Stagnant" implies a lack of movement or change, often signifying a state of inactivity rather than tumult. "Ordered" indicates a state of organization and arrangement, which is a fundamental contradiction to the chaos implied in the question. Therefore, "turmoil" is the most fitting word to describe a chaotic and tumultuous situation.