How to Say “No Idea” in Japanese

全然分からない
zenzen wakaranai
In Japanese, "no idea" can be expressed as 全然分からない (zenzen wakaranai).
The phrase 全然分からない is used to express a complete lack of understanding or knowledge about a subject.
Meaning: I don't know (intj)

What does it mean word for word?

The phrase is composed of 全然 (completely/not at all) and 分からない (do not understand).

How does it change in a sentence?

You can change the level of politeness by altering the verb ending: using wakaranai is the plain/informal version, while changing the ending to wakari-masen makes the phrase polite.

How do you pronounce it?

zenzen wakaranai

Did you know?

  • The phrase ピンと来ない (pin to konai) is a common way to say 'it doesn't click' or 'I have no idea what you mean' regarding a suggestion.
  • To express 'no idea' with a shrug, Japanese speakers might accompany the phrase with a slight tilt of the head or a small hand gesture near the chin, rather than the wide shoulder shrug common in English.
  • In many Japanese business contexts, instead of saying 'I have no idea', people use 存じ上げません (zonjiagemasen) to express the same thing with extreme humility.

Examples in context

  • 正直12音音楽って何がいいのか全然分からないんですよね。
    I honestly have no idea what would make a good twelve-note composition.
    This sentence is useful for expressing that you do not understand the appeal of a specific musical style using 全然分からない.
    Tatoeba #2941394 by tommy_san, translation #10130152 by tsp_2
  • この問題の答えが全然分からない。
    Kono mondai no kotae ga zenzen wakaranai.
    I have no idea what the answer to this problem is.
  • 彼女が何を考えているのか全然分からない。
    Kanojo ga nani o kangaete iru no ka zenzen wakaranai.
    I have no idea what she is thinking.

Example conversation

Two students are studying together in a library.

  1. 大翔 Hiroto

    この数学の公式、全然分からないよ。
    Kono suugaku no koushiki, zenzen wakaranai yo.
    I have no idea about this math formula.
  2. 結衣 Yui

    私も全然分からない。難しいね。
    Watashi mo zenzen wakaranai. Muzukashii ne.
    I have no idea either. It's difficult, isn't it?
  3. 大翔 Hiroto

    結衣ちゃん、教えてくれる?
    Yui-chan, oshiete kureru?
    Yui, can you teach me?
  4. 結衣 Yui

    ごめん、私も全然分からないんだ。
    Gomen, watashi mo zenzen wakaranai n da.
    Sorry, I have no idea either.

Sources

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Patrick Allen
Patrick AllenHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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