de ‧ ci ‧ sive /dɪˈsaɪsɪv/ BrE AmE adjective
[ Word Family: noun : ↑ decision , ↑ indecision ; adverb : ↑ decidedly , ↑ decisively ≠ ↑ indecisively ; adjective : ↑ decided ≠ ↑ undecided , ↑ decisive ≠ ↑ indecisive ; verb : ↑ decide ]
1 . an action, event etc that is decisive has a big effect on the way that something develops
decisive factor/effect/influence etc
Women can play a decisive role in the debate over cloning.
decisive action/steps
We will take decisive steps towards political union with Europe.
2 . someone who is decisive is good at making decisions quickly and with confidence OPP indecisive :
a decisive leader
a talent for quick decisive action
3 . definite and clear in a way that leaves no doubt OPP indecisive
decisive victory/result/defeat etc
The answer was a decisive no.
—decisively adverb :
Yet again, we have failed to act decisively.
—decisiveness noun [uncountable] :
military decisiveness
the speed and decisiveness of his victory