Violent, severe.
Needing only a brief exposure time. (of a lens, plate, film, etc.)
Very swift or quick.
Steep, changing altitude quickly. (of a slope)
a rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.
Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.