How to say "legitimate" in Japanese

Choosing the right word
  • 正統せいとうCommon
    na-adjective, no-adjectiveCovers 'legitimate' in the sense of rightful or orthodox, as of succession, lineage, or doctrine. It emphasizes being the true, proper line or school rather than mere legality, as in legitimate heirs or orthodox teachings.
    どちらの王子おうじが正統せいとうな王位おうい継承者けいしょうしゃか。↗
    Which prince is the legitimate heir to the throne?
  • 合法ごうほうCommon
    na-adjective, no-adjectiveCovers 'legitimate' meaning lawful or legal, that is, permitted by law. It is the usual choice when the contrast is simply with what is illegal, as in legitimate business activities.
    その議論ぎろんに関かんする討論とうろんは合法ごうほうであるようだ。↗
    A discussion of the proposal seems to be in order.
  • 適法てきほうCommon
    na-adjective, no-adjectiveAlso covers 'legitimate' meaning lawful or legal, with a somewhat formal, legal-technical flavor. It suits contexts such as court rulings or regulations where proper legal procedure is at issue rather than everyday legality.
  • 合法的ごうほうてきCommon
    na-adjectiveThe adjectival form corresponding to 合法, meaning legal, lawful, or legitimate. Use it when you need an adjective directly modifying a noun, as in a legitimate or lawful method; it can also suggest law-abiding behavior.
    あなたは合法的ごうほうてき手段しゅだんで行動こうどうする方ほうがよい。↗
    It is better for you to act by legal means.
  • 正規せいきJLPT N1approx.Common
    no-adjective, na-adjectiveCovers 'legitimate' in the sense of regular, formal, or official, as in a legitimate or proper channel or procedure. Its focus is on conforming to established, official norms rather than on legality alone.

Use 正統 for legitimate in the sense of rightful or orthodox authority, 合法 or 適法 for lawful and legal senses (合法的 as the adjectival form), and 正規 for formal, regular, or official legitimacy.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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