decisive
🇺🇸
/dɪˈsaɪsɪv/
🇬🇧
/dɪˈsaɪsɪv/
very important for the final outcome
Her vote was decisive in choosing the winner.
彼女の投票は勝者を選ぶ上で決定的でした。
able to make quick and firm decisions
A good leader must be decisive when facing challenges.
良いリーダーは課題に直面した時に決断力がなければなりません。