rapid

 
Pronunciation: /ˈrapɪd/

adjective

  • happening in a short time or at a great rate: the country’s rapid economic decline they lost three wickets in rapid succession
  • (of an action) characterized by great speed: they made a rapid exit

noun

(usually rapids)
  • a fast-flowing and turbulent part of the course of a river: those of you looking for adventure can shoot the rapids

Derivatives

rapidness

noun

Origin:

mid 17th century: from Latin rapidus, from rapere 'take by force'