UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪmˈpɛtʃuəs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ɪmˈpɛtʃuəs/ ,USA pronunciation: respelling(im pecho̅o̅ əs)

WordReference Random House Learner's Dictionary of American English © 2020
im•pet•u•ous /ɪmˈpɛtʃuəs/USA pronunciation   adj. 
  1. of, relating to, or characterized by sudden or rash action or emotion; impulsive:an impetuous youth.
im•pet•u•os•i•ty /ɪmˌpɛtʃuˈɑsɪti/USA pronunciation  n. [uncountable]
im•pet•u•ous•ly, adv. See -pet-.

WordReference Random House Unabridged Dictionary of American English © 2020
im•pet•u•ous  (im pecho̅o̅ əs),USA pronunciation adj. 
  1. of, pertaining to, or characterized by sudden or rash action, emotion, etc.;
    impulsive:an impetuous decision; an impetuous person.
  2. having great impetus;
    moving with great force;
    violent:the impetuous winds.
im•petu•ous•ly, adv. 
im•petu•ous•ness, n. 
  • Late Latin impetuōsus, equivalent. to Latin impetu(s) impetus + -ōsus -ous
  • Anglo-French
  • Middle English 1350–1400
    • 1.See corresponding entry in Unabridged eager, headlong.
      Impetuous, impulsive both refer to persons who are hasty and precipitate in action, or to actions not preceded by thought.
      Impetuous suggests eagerness, violence, rashness:impetuous vivacity;
      impetuous desire;
      impetuous words.
      Impulsive emphasizes spontaneity and lack of reflection:an impulsive act of generosity.
    • 1.See corresponding entry in Unabridged planned, careful.

Collins Concise English Dictionary © HarperCollins Publishers::
impetuous /ɪmˈpɛtjʊəs/ adj
  1. liable to act without consideration; rash; impulsive
  2. resulting from or characterized by rashness or haste
  3. poetic moving with great force or violence; rushing: the impetuous stream hurtled down the valley
Etymology: 14th Century: from Late Latin impetuōsus violent; see impetus

imˈpetuously adv imˈpetuousness, impetuosity /ɪmˌpɛtjʊˈɒsɪtɪ/ n
'impetuous' also found in these entries (note: many are not synonyms or translations):
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