"decisive" in the adjective sense
1. decisive
determining or having the power to determine an outcome
"cast the decisive vote"
"two factors had a decisive influence"
2. decisive
unmistakable
"had a decisive lead in the polls"
3. decisive
characterized by decision and firmness
"an able and decisive young woman"
"we needed decisive leadership"
"she gave him a decisive answer"
4. critical, decisive
forming or having the nature of a turning point or crisis
"a critical point in the campaign"
"the critical test"
Source: WordNet® (An amazing lexical database of English)
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