rapid

/ˈræpɪd/
adjective
  1. Happening very quickly or in a short time.
    • The city has seen rapid growth in the last decade.
    • There was a rapid increase in temperature this afternoon.
    • She made a rapid recovery after the surgery.
  2. Moving or acting with great speed.
    • The boat moved at a rapid pace across the lake.
    • He took a rapid step backward to avoid the falling branch.
    • The cheetah is known for its rapid sprint.
Antonyms
noun
  1. A fast-moving part of a river where the water flows over rocks or a steep drop.
    • The kayakers navigated the dangerous rapids with skill.
    • The river has several rapids that are popular for rafting.
    • We could hear the roar of the rapids from a mile away.
What does "rapid" mean? | whatsthatwordmean | whatsthatwordmean