decisive; definitive; conclusive
Describes something that settles a matter, provides final proof, or determines an outcome. Often used with nouns like 証拠, 瞬間, 打撃, 勝利, 違い.
That became the decisive evidence.
The match reached a decisive moment.
The police obtained conclusive evidence for the case.
That photo captures the decisive moment of the match.
There is a crucial difference between the two proposals.
The company suffered a decisive blow from the recession.
The team achieved a decisive victory in the final.