The word "fulminant" means sudden and dramatic, so antonyms for "most fulminant" would be words that convey a sense of slowness, gradualness, or mildness. Some possible antonyms for "most fulminant" might include terms like "gradual," "moderate," "gentle," "slow," "calm," "soothing," or "mild." For example, one might say that a disease is progressing gradually rather than developing most fulminantly, or that a storm is moderate in intensity rather than being the most fulminant storm ever recorded. Antonyms provide a way to contrast words and concepts, helping to create a nuanced and detailed understanding of language and the world around us.