決断する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 決断する | 決断しない |
| Polite | 決断します | 決断しません |
| Past polite | 決断しました | 決断しませんでした |
| Past | 決断した | 決断しなかった |
| Te-form | 決断して | 決断しないで |
| Desire | 決断したい | 決断したくない |
| Potential | 決断できる | 決断できない |
| Passive | 決断される | 決断されない |
| Causative | 決断させる | 決断させない |
| Causative passive | 決断させられる | 決断させられない |
| Volitional | 決断しよう | |
| Polite volitional | 決断しましょう | |
| Imperative | 決断しろ | 決断するな |
| Conditional | 決断すれば | 決断しなければ |
| Tara conditional | 決断したら | 決断しなかったら |
noun, noun or participle which takes 'suru', transitive verb
decision; determination; resolution
Refers to making a firm, often important decision after consideration. Used as both a noun and a suru-verb.
He made the decision to study abroad.
経営陣は早期の決断を迫られている。
Management is being pressed for an early decision.
The president made an important decision.
He was being pressed to make a difficult decision.
She made the major decision to quit her job.
He's slow to make decisions, which troubles everyone.
決断 is the formal noun for 'making a decision', while 思い切り (as a noun) emphasizes the inner resolve or boldness behind that decision.
決断する emphasizes making a firm, resolute decision often after deliberation, while 決める is neutral and can describe even trivial choices.
決断する emphasizes the act of making a bold or difficult decision, whereas 決する is broader and can describe any matter being settled, including by others or by events.