Pronunciation IPA (key): /imˈpɛtʃuəs/ Audio (US)(file) Adjective Positive impetuous Comparative more impetuous Superlative most impetuous When you are impetuous, you act quickly without thinking about your actions. Synonyms: impulsive, hasty, rash and hotheaded Jeremiah made an impetuous decision.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads