churning

(verb) stir (cream) vigorously in order to make butter. Synonyms: churn.

(verb) be agitated. Synonyms: churn, boil, moil, roil. Example: "The sea was churning in the storm."

(adj) moving with or producing or produced by vigorous agitation. Synonyms: churned-up. Examples: "Winds whipped the piled leaves into churning masses." "A car stuck in the churned-up mud."

(adj) (of a liquid) agitated vigorously; in a state of turbulence. Synonyms: roiling, roiled, roily, turbulent. Examples: "The river's roiling current." "Turbulent rapids."