IPA: /ɪmˈpʌlsɪvli/
KK: /ɪmˈpʌlsɪvli/
In a way that is done suddenly and without careful thought or planning.
She impulsively bought a new dress without checking her budget.
Impulsively → It is formed from "impulse" (from Latin "impulsus", meaning a push or a driving force) and the suffix "-ively" (meaning in a manner of). The word "impulsively" describes acting in a manner that is driven by a sudden urge or push without careful thought.
Think of a sudden 'push' ('impulsus') that makes you act 'in a manner' ('-ively') without thinking — that's what impulsively means.