Translation guide
The English word "naive" describes a lack of experience, wisdom, or judgment, often implying innocence or a tendency to trust too easily. In Japanese, there is no single perfect equivalent; the best choice depends on whether you mean innocent/pure, gullible, inexperienced, or overly optimistic.
Describing someone who is simple, innocent, or childlike, without negative judgment.
Means 'pure' or 'innocent', often used positively for someone untainted by the world. It can imply naivety in a gentle way.
She is naive and doesn't know how to doubt people.
Means 'innocent' or 'childlike', often implying a lack of guile. Can be used for naive trustfulness.
Everyone smiled at his naive question.
Describes an innocent, childlike appearance or manner. Often used for looks or behavior, not deep personality.
Her naive smile was heartwarming.
Describing someone who is too trusting and easily fooled.
Literally 'easy to deceive'. A straightforward way to say someone is gullible or naive.
He's naive, so be careful.
Means 'soft-hearted' or 'pushover'. Implies naive trust that others take advantage of.
Literally 'sweet', but can mean 'naive' or 'overly optimistic' in thinking. Often used in phrases like 考えが甘い (one's thinking is naive).
Means 'simple' or 'simple-minded'. Can imply naivety when referring to a person's thinking.
Describing someone who is naive due to lack of experience, often in a specific area.
Literally 'not knowing the world'. A common term for someone naive about how society works.
He's naive about the world, so he gets tricked easily.
Means 'innocent' or 'naive', often used for someone inexperienced in love or social matters.
Literally 'blue', but can mean 'inexperienced' or 'green'. Often used for young, naive people.
Describing ideas or plans that are naive because they ignore difficulties.
Means 'too optimistic'. A direct way to call an idea naive.
His outlook is too naive.
A common phrase meaning 'one's thinking is naive/overly optimistic'.
A colloquial, slightly derogatory term meaning 'naive' or 'half-baked'. Used for ideas or people.
純粋 (junsui) emphasizes purity and lack of corruption, often positive. 無邪気 (mujaki) is childlike innocence, often about behavior. 世間知らず (seken shirazu) specifically means lacking worldly experience, and can be slightly negative or pitying.
There is no single Japanese word that covers all uses of 'naive'. Using ナイーブ (naību) is a loanword, but it often means 'sensitive' or 'touchy' in Japanese, not 'naive'. Avoid it unless you mean emotionally sensitive.
She has a naive charm.
That person is too naive and gets tricked easily.
That plan is too naive.
彼は単純だから、何でも信じてしまう。
He's naive, so he believes anything.
She's still naive and has little romantic experience.
Your thinking is still naive.
Thinking you'll succeed that easily is naive.
You'll fail with such a naive plan.