How to say "genuine" in Japanese

Choosing the right word
  • 純正じゅんせいCommon
    na-adjective, nounGenuine in the sense of official: made by the original maker rather than a third party, as with genuine parts and accessories for cars, cameras, and other equipment.
    これは純正じゅんせいの英語えいごとは違ちがった文体ぶんたいだ。↗
    This is a writing style different from genuine English.
  • 純粋じゅんすいJLPT N2approx.Common
    na-adjective, no-adjectiveIts core sense is 'pure' — unmixed, untainted. As 'genuine' it describes pure, genuine feelings, motives, or intentions: sincerity of heart rather than authenticity of objects.
    純粋じゅんすいに、ミクシィユーザーが言いうところの「変へんな人ひと」ってどんな人ひとなのか、私にはいまいちわからないのだ。↗
    It's simply that I don't really understand what an "oddball" is when said by a Mixi user.
  • 真正しんせいCommon
    na-adjective, no-adjectiveGenuine in the strict sense: the authentic thing itself, not a fake, counterfeit, or imitation. It suits statements that something is the real thing — the true original, not a copy.
  • 本格的ほんかくてきCommon
    na-adjectiveGenuine as 'full-fledged': the real, serious version of something — an authentic-style dish, a full-scale effort or storm. Its focus is seriousness and proper form rather than authenticity as opposed to fakes.
  • 生粋きっすいCommon
    no-adjectiveGenuine by birth: natural-born, trueborn. It describes people whose identity is genuine through and through — a born-and-bred local, a natural-born craftsman — rooted in birth and lineage rather than in objects.
    彼かれは生粋きっすいのパリっ子こです。↗
    He is a Parisian born and bred.

Pick by what is genuine: 純正 for official maker's goods, 純粋 for unmixed feelings and motives, 真正 for authenticity as opposed to fakes, 本格的 for full-scale seriousness, and 生粋 for people genuine by birth.

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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