jí​sù

rapid

急速 jí​sù
rapid descriptive
moving at a very high speed or acting in a hurried manner

The ambulance sped towards the scene of the accident.

fast-paced descriptive
progressing or developing at an extremely high rate

The region's economy has experienced rapid development over the past decade.

Frequency

Movie subtitles
2.59 per million appears in 1% of films
Written text
5.96 per million

Sources

Definitions
CC-CEDICT