Adverb
in an impulsive or impetuous way; without taking cautions
Source: WordNethe often acts impulsively and later regrets it Source: Internet
Violet Beauregarde impetuously grabs an experimental piece of gum and chews herself into a giant blueberry. Source: Internet
Snape's memories then reveal that Dumbledore had impetuously tried to use the Gaunt ring which had been cursed by Voldemort, and had been suffering from a powerful curse. Source: Internet