impetuous

 
Pronunciation: /ɪmˈpɛtjʊəs/

adjective

  • acting or done quickly and without thought or care: she might live to rue this impetuous decision
  • moving forcefully or rapidly: an impetuous but controlled flow of water

Derivatives

impetuosity

Pronunciation: /-ˈɒsɪti/
noun

impetuously

adverb

impetuousness

noun

Origin:

late Middle English: from Old French impetueux, from late Latin impetuosus, from impetere 'to attack'