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English definition of “decisive”

decisive

adjective  /dɪˈsɑɪ·sɪv/ us  
making choices quickly and surely, without having any doubts: In an emergency, decisive action is called for. Decisive also means without doubt or question, and of the greatest importance: DNA test results were decisive in proving his innocence.
decisively
adverb  /dɪˈsɑɪ·sɪv·li/ us  
We had to act quickly and decisively to put out the fire.
(Definition of decisive from the Cambridge Academic Content Dictionary © Cambridge University Press)
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