Most churned can be replaced by a variety of synonyms depending on the context. Some possible synonyms for most churned might include: most agitated, most turbid, most turbulent, most stirred up, most unsettled, most roiling, most tumultuous, most chaotic, most raging, most tempestuous, most violent, most rough, most stormy. In general, most churned refers to a state of great activity or upheaval, often in reference to a body of water, but it can also be used metaphorically to describe a situation or emotional state. When searching for synonyms, it's important to consider the tone and context of the original usage to find the best fit.