Antonym: indecisive. Similar words: decision, derisive, precise, precisely, imprecise, decide, decide on, passive. Meaning: [dɪ'saɪsɪv] 
adj. 1. determining or having the power to determine an outcome 2. unmistakable 3. characterized by decision and firmness 4. forming or having the nature of a turning point or crisis.
adj. 1. determining or having the power to determine an outcome 2. unmistakable 3. characterized by decision and firmness 4. forming or having the nature of a turning point or crisis. 
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1 Man is a decisive factor in doing everything.
2 The enemy was defeated in a decisive battle.
3 You need to be more decisive.
4 She has played a decisive role in the peace negotiations.
5 Women can play a decisive role in the debate over cloning.
6 Climate was a decisive factor in establishing where the tournament should be held.
7 The might of the army could prove a decisive factor.
8 Voters perceive him as a decisive and resolute international leader.
9 He had one potentially decisive factor in his favour: the element of surprise.
10 The decisive attack took off fromthe foremost position.
11 They have vowed a quick and decisive response.
12 The answer was a decisive no.
13 The government must take decisive action on gun control.
14 The enemy lost heavily in the decisive battle.
15 He has a decisive majority over his main rivals.
16 A decisive person acts quickly and often succeeds.
17 Her style is commanding,[sentencedict.com] decisive and responsible.
18 In business Jane was clear-headed and decisive.
19 The decisive goal arrived against the run of play.
20 What most people want to see is determined, decisive action and firm leadership.
21 Be decisive tell them exactly what you think should be done!
22 The economy is regarded as the decisive/key factor which will determine the outcome of the general election.
23 I work very efficiently and am decisive,(www.Sentencedict.com) and accurate in my judgement.
24 This is a time of decisive action and quick thinking.
25 We will take decisive steps towards political union with Europe.
26 He's a quick and decisive player - a force to be reckoned with .
27 They offered opposing players bribes to fix a decisive league match against Valenciennes.
28 There is a moment in every battle at which the least maneuver is decisive and gives superiority as one drop of water causes overflow. 
29 The injury to their key player could be a decisive factor in the game.
30 They were outplayed by the Colombians' slick passing and decisive finishing.
More similar words: decision, derisive, precise, precisely, imprecise, decide, decide on, passive, massive, deceive, pervasive, offensive, effusive, persuasive, obtrusive, defensive, deceptive, excessive, extensive, undeceive, recessive, expensive, exclusive, regressive, aggressive, impressive, responsive, progressive, exclusively, inquisitive.