[ adjective ] (of a liquid) agitated vigorously; in a state of turbulence
"the river's roiling current" "turbulent rapids"
Used in print(T. C. McClary, "The Flooded Desert," Argosy,...)
There was no real sign of the river now , just a roiling , oily ribbon of liquid movement through muddy waters that reached everywhere .
She was watching a tree ride wildly down that roiling current .