decisive
/dɪˈsaɪsɪv/adjective
1- settling an issue; producing a definite result决定性的：
the archers played a decisive part in the victory
弓箭手对胜利起到了决定性的作用
decisive evidence.
关键性证据。
1.1
- (of a person) having or showing the ability to make decisions quickly and effectively.（人）决断的, 果断的。
派生词
decisively
adverbdecisiveness
noun词源
early 17th cent.: from French décisif, -ive, from medieval Latin decisivus, from decis- 'determined'， from the verb decidere （see DECIDE）.