IPA: /dɪˈsaɪsɪvli/
KK: /dɪˈsaɪsɪvli/
In a way that shows a clear decision or determination, without hesitation.
She spoke decisively during the meeting, making it clear what needed to be done.
Decisively → It is formed from "decidere" (meaning to cut off or settle) and the suffix "-ly" (meaning in a manner of). The word "decisively" means in a manner that settles or determines something clearly and firmly.
Think of making a clear decision that 'cuts off' any doubt — that's why decisively means to act in a way that settles things.