rapid
Very swift or quick.
Steep, changing altitude quickly. (of a slope)
Needing only a brief exposure time. (of a lens, plate, film, etc.)
(England, dialectal) Violent, severe.
(obsolete, dialectal) Happy.
(colloquial) Rapidly.
A rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.
(dated) A burst of rapid fire.
(chess) Rapid chess.