The antonyms for the word "most stormful" are calm, peaceful, serene, tranquil, and mild. These words denote a state of calmness and tranquility as opposed to the turmoil and chaos depicted by the word stormful. These antonyms can be used to describe the weather, situations, or even a person's personality. A calm and serene environment can be achieved by practicing meditation, mindfulness techniques, and engaging in peaceful activities like yoga or reading. In summary, when faced with stormful situations, it's essential to seek tranquility by embracing the antonyms that represent a peaceful state of mind.