decisive

1、决定性的，关键的

a decisive factor/victory/battle 决定性的因素/胜利/战役

She has played a decisive role in the peace negotiation

她在和谈中起了关键作用

a decisive step towards a cleaner environment

朝着更清洁的环境迈出的关键一步

2、坚决的，果断的

decisive management 果断的管理层

The government must take decisive action on gun control

政府必须在枪支管制上采取果断措施。