1.
decisive, conclusive
Settling a matter conclusively; leaving no room for doubt or further debate.
決定的な証拠が見つかった。
Conclusive evidence was found.
二人の関係に決定的な亀裂が生じた。
An irreparable rift developed in their relationship.
2.
critical, crucial
So important as to determine the outcome; having decisive impact.
そのゴールが決定的な瞬間だった。
That goal was the decisive moment.
彼の失言が決定的なダメージを与えた。
His slip of the tongue caused critical damage.
決定的 is a na-adjective formed from 決定 (decision, determination) + 的.
FORMS:
- Adverbial: 決定的に
- Predicative: 決定的だ
- Attributive: 決定的な+noun
USAGE NOTE:
Often used for evidence that settles a case, or for moments that determine outcomes. Can have both positive and negative connotations depending on context.
COLLOCATIONS:
- 決定的な証拠 - conclusive/decisive evidence
- 決定的な違い - decisive difference
- 決定的な瞬間 - decisive moment
- 決定的に欠けている - critically lacking
SIMILAR WORDS:
- 決定的 vs. 致命的: 決定的 means conclusive/decisive; 致命的 means fatal/deadly
- 決定的 vs. 確定的: 決定的 emphasizes decisiveness; 確定的 emphasizes certainty
Related Words
Related:
決定 (decision (noun))