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N4Lesson notes · Oct 4, 2026

Lie in Japanese: 嘘うそ (うそ), 嘘うそをつく, うそ!, and 嘘うそつき

"A lie" in Japanese is 嘘うそ (うそ), and "to tell a lie" is 嘘うそをつく (うそをつく). A liar is 嘘うそつき (うそつき). But in conversation, うそ! usually is not an accusation at all: it means "No way!" or "Really?!", a reaction to surprising news.

嘘うそ is a short word with a big range. Said slowly and seriously, it is a lie. Said fast with wide eyes, it is surprise. Japanese also has gentle ways to say "just kidding" and a proverb that defends small lies told for good reasons. This post covers the verb, the exclamation, and how not to accidentally call your friend a liar.

How do you say "lie" in Japanese?

What does 嘘うそ mean?

嘘うそ (うそ) is a lie: something that is not true. The verb is 嘘うそをつく, "to tell a lie". The kanji is hard, so you will often see うそ in hiragana or ウソ in katakana.

嘘うそをつかないで。 — Don't lie. (casual) 彼かれは嘘うそをついた。 — He told a lie. (casual)

Note the verb: 嘘うそをつく, not 嘘うそを言いう. 嘘うそを言いう exists, but 嘘うそをつく is the fixed phrase.

What does 嘘うそつき mean?

嘘うそつき (うそつき) is a liar. It is a strong word, and children use it a lot.

嘘うそつき! — Liar! (casual, strong)

Why does うそ! mean "no way"?

うそ! or うそでしょ! is a reaction to surprising news, like "No way!" or "Seriously?". It does not mean you think the person is lying.

え、うそ!本当ほんとう? — What, no way! Really? (casual, surprised) うそでしょ、もう終おわったの? — You're kidding, it's already over? (casual)

For more surprise reactions, see really in Japanese.

How do you talk about lies and jokes?

What does 冗談じょうだん mean?

冗談じょうだん (じょうだん) is a joke. 冗談じょうだんだよ, "it's a joke", is the Japanese "just kidding".

冗談じょうだんだよ、怒おこらないで。 — Just kidding, don't be mad. (casual) 冗談じょうだんでしょ? — You're joking, right? (casual)

How do you say "I'm not lying"?

嘘うそじゃない is "it's not a lie". 本当ほんとうだよ, "it's true", sounds more natural for reassurance.

嘘うそじゃないよ、本当ほんとうだよ。 — I'm not lying, it's true. (casual)

For "I believe you", see believe in Japanese.

What is a white lie?

A white lie can be called 優やさしい嘘うそ (やさしいうそ), "a kind lie", told to protect someone's feelings.

それは優やさしい嘘うそだった。 — It was a white lie. (casual)

Word Reading Meaning
嘘うそ うそ lie
嘘うそをつく うそをつく to tell a lie
嘘うそつき うそつき liar
うそ! うそ No way!
冗談じょうだん じょうだん joke
優やさしい嘘うそ やさしいうそ white lie
嘘うそも方便ほうべん うそもほうべん a lie can be useful

Beyond the basics

What does 嘘うそも方便ほうべん mean?

嘘うそも方便ほうべん (うそもほうべん), "a lie is also a means", means a lie can be justified if it serves a good purpose. It comes from Buddhist teaching and is used to defend small, kind lies.

嘘うそも方便ほうべんって言いうしね。 — Well, they say a lie can be useful. (casual)

What does 嘘うそみたい mean?

嘘うそみたい, "like a lie", means "unbelievable" in a positive or amazed way.

嘘うそみたいに晴はれた。 — It cleared up unbelievably well. (casual) 夢ゆめが叶かなったなんて、嘘うそみたい。 — I can't believe my dream came true. (casual)

What is 嘘八百うそはっぴゃく?

嘘八百うそはっぴゃく (うそはっぴゃく), "eight hundred lies", means a pack of lies, nonsense from start to finish.

あの話はなしは嘘八百うそはっぴゃくだ。 — That story is a pack of lies. (casual)

What does 嘘うそでしょ mean with a flat tone?

The same words change meaning with tone. A rising, excited うそでしょ! is surprise. A flat, cold 嘘うそでしょ。 can mean "That can't be true", real doubt. Watch the speaker's face and voice.

嘘うそでしょ。そんなはずない。 — That can't be right. It's impossible. (casual, doubtful)

If you want to be clear that you believe the other person, add 本当ほんとう?すごい! right after your うそ!.

Common mistakes

  • Taking うそ! as an accusation. It is usually surprise.
  • Saying 嘘うそを言いう as the default. The fixed verb is 嘘うそをつく.
  • Calling someone 嘘うそつき lightly. It is strong; use 冗談じょうだんでしょ? to tease.
  • Reading 冗談じょうだん as じょだん. It is じょうだん.
  • Using 嘘うそみたい only negatively. It often means "amazingly".

Practice

Try each answer before opening it. Questions 3 and 4 are a pair: surprise versus a real accusation.

1. Say casually, "Don't lie."

Show answer

嘘うそをつかないで。 — 嘘うそをつく.

2. Say "He told a lie."

Show answer

彼かれは嘘うそをついた。 — ついた.

3. Your friend says they won a trip. React with surprise.

Show answer

え、うそ!本当ほんとう? — うそ! is surprise.

4. A child broke a promise. Shout an accusation.

Show answer

嘘うそつき! — a real accusation. This is the pair to question 3.

5. Say "Just kidding, don't be mad."

Show answer

冗談じょうだんだよ、怒おこらないで。 — 冗談じょうだん.

6. Reassure a friend: "I'm not lying, it's true."

Show answer

嘘うそじゃないよ、本当ほんとうだよ。 — 本当ほんとうだよ.

7. Say "It was a white lie."

Show answer

それは優やさしい嘘うそだった。 — 優やさしい嘘うそ.

8. Defend a small lie with the proverb.

Show answer

嘘うそも方便ほうべんって言いうしね。 — 嘘うそも方便ほうべん.

9. Say "I can't believe my dream came true."

Show answer

夢ゆめが叶かなったなんて、嘘うそみたい。 — 嘘うそみたい.

10. Fix: 彼かれは嘘うそを言いった。 (use the fixed phrase)

Show answer

彼かれは嘘うそをついた。 — 嘘うそをつく.

FAQ

How do you say "lie" in Japanese? 嘘うそ (うそ).

How do you say "to tell a lie"? 嘘うそをつく.

Does うそ! mean "you're lying"? Usually not; it means "No way!".

How do you say "liar"? 嘘うそつき (うそつき).

How do you say "just kidding"? 冗談じょうだんだよ.

What does 嘘うそも方便ほうべん mean? A lie can be justified for a good purpose.

Vocabulary from this article

Tap the block to select all of it, then copy. In Anki: File → Import, note type Basic, separator Tab — the first column becomes the front, the second the back.

嘘	うそ — lie
嘘をつく	うそをつく — to tell a lie
嘘つき	うそつき — liar
冗談	じょうだん — joke
優しい嘘	やさしいうそ — white lie
嘘も方便	うそもほうべん — a lie can be useful
嘘みたい	うそみたい — unbelievable
嘘八百	うそはっぴゃく — a pack of lies
本当	ほんとう — truth, real
晴れる	はれる — to clear up

I'm Yuuki, a Japanese teacher based in Tokyo. I've taught on italki as a Top 1% teacher and watched over 1,500 anime. うそ! is a reaction learners often misread as an accusation, and once they hear it as "No way!", Japanese conversations suddenly sound much friendlier. For practice with feedback, Book a trial lesson · $13, or try the Japanese practice exercises first.

Sources: the author's own lessons and standard reference dictionaries.

More drills like the ones above, plus a timed JLPT-style mock test: Practice · N4 · Read something at this level: JLPT N4 stories with audio

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