How to say "decided" in Japanese

• 既決きけつ
  no-adjectiveRefers to something already settled or finalized, typically in legal or official contexts; being less common and narrow in use, it is seldom the word you want for an ordinary 'decided'.
• 確定的かくていてき
  na-adjectiveCovers the 'definite; certain; fixed' side of 'decided': it describes something as conclusive rather than referring to a decision itself, so it is seldom the word you want for saying what you have decided.
• お決まりおきまり
  expressionCovers 'decided' as in the customary or usual — something settled by habit or convention rather than a fresh decision; the initial お marks it as polite (teineigo) language.

None of these is the everyday word for making a personal decision: 既決 is for matters already settled or finalized, 確定的 for something definite or fixed, and 「お決まり」 for the customary or usual choice.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 既決きけつdecided
• 確定的かくていてきdefinite
• お決まりおきまりdecided