Meaning of “decisive” - Learner’s Dictionary

decisive

adjective uk us /dɪˈsaɪsɪv/
AFFECTING

strongly affecting how a situation will progress or end:

a decisive goal/victory
Seeing that advertisement was a decisive moment in my life.
MAKE DECISIONS

B2 making decisions quickly and easily:

You need to be more decisive.
→ Opposite indecisive
decisively adverb

We must act quickly and decisively to stop the spread of the disease.
decisiveness noun [ U ]

(Definition of “decisive” from the Cambridge Learner’s Dictionary © Cambridge University Press)