not calm or controlled but rather characterized by confusion, agitation, disturbance, and disorder, or causing such conditions of chaos, violence, or unrest;
e.g. The politics of the region are turbulent and unpredictable.
(adjective)
showing an unsteady or irregular pattern of motion, often with a disturbed or violent physical state;
e.g. The airplane was travelling through turbulent air conditions, making the ride bumpy.