impetuously
Adverb
Meaning
in an impulsive or impetuous way; without taking cautions
Source: WordNetSynonyms
abruptly
wildly
passionately
instinctively
carelessly
headlong
negligently
rashly
impulsively
impatiently
irresponsibly
unwisely
imperiously
pell-mell
suddenly
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Antonyms
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he often acts impulsively and later regrets it
Violet Beauregarde impetuously grabs an experimental piece of gum and chews herself into a giant blueberry.
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.