impulsively
Definitions
In a manner characterized by acting or doing something without forethought.
In a way that is driven by sudden, involuntary, or instinctive urges.
Examples
She impulsively bought the expensive dress without checking the price tag first.
He impulsively decided to quit his job and travel the world on a whim.
Synonyms
spontaneously rashly hastily recklessly impetuously abruptly capriciously
Antonyms
deliberately cautiously thoughtfully carefully methodically intentionally prudently