How to say "naive" in Japanese

Choosing the right word
  • 純じゅんCommon
    na-adjective, taru-adjective, adverb (with と)Covers naive in the sense of innocent and pure, with an overtone of chastity. Suits describing a person or heart free of guile and worldly desire.
  • 素朴そぼくJLPT N1approx.Common
    na-adjective, nounNaive in the sense of artless and unsophisticated: an unaffected person or manner, a simple, unpretentious question. The nuance is honest simplicity rather than gullibility.
    素朴そぼくな疑問ぎもんなんだけど、・・・トラとライオンはどっちが強つよいの?↗
    This may be a silly question, but which is stronger - a tiger or a lion?
  • 初々しいういういしいCommon
    i-adjectiveNaive as fresh, green inexperience: a young person still untouched by the ways of the world, or someone new to a role. The tone is affectionate, treating the inexperience as endearing.
  • 純真じゅんしんCommon
    na-adjective, nounNaive as pure-hearted and unspoilt: innocence of heart, free of guile or corruption. Warmly positive, typically of children and the young.
    彼女かのじょの純真じゅんしんげなそぶりは見みせかけで本物ほんものではない。↗
    Her air of innocence is apparent, not real.
  • 単純たんじゅんJLPT N3approx.Common
    na-adjective, nounReally means simple, plain or uncomplicated — a straightforward structure or explanation. Applied to a person it suggests simple-mindedness, so it fits naive only in that sense, not innocent charm.
    彼かれの話はなしは単純たんじゅんそのものだった。↗
    His story was simplicity itself.

For artless, unsophisticated naivety choose 素朴, for the fresh innocence of youth 「初々しい」, for pure-hearted innocence 純真, for innocent purity with a chaste nuance 純, and for simple-mindedness rather than innocence 単純.

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

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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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