What is the word most opposite in meaning to "tranquil"?

"Tranquil" refers to a state of peace, calmness, and serenity. The term embodies an absence of disturbance and a presence of quiet and stillness. Therefore, the word that is most opposite in meaning would be one that suggests chaos or disturbance.

The word "tumultuous" captures this opposite meaning as it describes a situation that is noisy, disorderly, or characterized by unrest. It conveys a sense of turbulence and upheaval that stands in stark contrast to the soothing and composed nature of being tranquil. This makes it the most appropriate choice among the options provided, as it conveys a significant level of disruption compared to the calm and peaceful connotations of the word "tranquil."