Hello, I’m Kodak.
You ask a Japanese friend a question. They nod and say:
Un.
うん = casual “yeah,” “uh-huh,” or “mm-hm”
はい = polite or neutral “yes” and “I’m listening”
うん (un) is a casual response used to show agreement, understanding, acceptance, or that you are listening. It can mean “yeah,” “yes,” “uh-huh,” “okay,” or “I know.”
はい (hai) is the safer polite response. Use it with teachers, unfamiliar people, customers, supervisors, and anyone with whom you are speaking politely.
A nod with うん may signal “yes,” but it may also simply mean “I’m listening” rather than complete agreement.
① what うん (un) means
② the difference between うん and はい
③ why Japanese speakers nod while saying うん
④ when a nod means “yes” and when it only means “I’m listening”
⑤ how to use うん with friends and family
⑥ the differences among うん, ううん, うーん, and うんうん
⑦ how tone changes the feeling of うん
⑧ natural examples, anime usage, and common mistakes
What Does Un Mean in Japanese?
Hiragana: うん
Romaji: un
Part of speech: interjection
Common meanings: yes; yeah; uh-huh; mm-hm; okay; I understand; I agree
うん is a casual response word. Japanese dictionaries describe it as a word showing that the speaker has understood or accepted the other person’s intention.
Depending on the situation, it may translate as:
“Yes.”
“Uh-huh.”
“Mm-hm.”
“Okay.”
“I know.”
“I understand.”
A：明日も来る？
Ashita mo kuru?
Are you coming tomorrow too?B：うん、来るよ。
Un, kuru yo.
Yeah, I am.
A：あとで電話してね。
Ato de denwa shite ne.
Call me later, okay?B：うん、わかった。
Un, wakatta.
Okay, got it.
It is an interjection, just like English “yeah” or “uh-huh,” rather than a conjugated form of a verb.
What Does Hai Mean in Japanese?
Hiragana: はい
Romaji: hai
Part of speech: interjection
Common meanings: yes; certainly; I understand; I am listening; here/present
はい is used for a polite response, for confirming another person’s words, and for answering when your name is called.
先生：田中さん。
Sensei: Tanaka-san.
Tanaka?学生：はい。
Gakusei: Hai.
Yes? / Here.
A：この書類を確認してください。
Kono shorui o kakunin shite kudasai.
Please check this document.B：はい、わかりました。
Hai, wakarimashita.
Yes, understood.
“I heard you.”
“I’m listening.”
“I understand what you said.”
Understanding a message is not always the same as agreeing with the speaker’s opinion.
Un vs Hai: What Is the Difference?
⇒ casual
⇒ “yeah,” “uh-huh,” or “okay”
⇒ used with friends, family, partners, children, and people you speak casually with
はい (hai)
⇒ polite or neutral
⇒ “yes,” “I understand,” or “I’m listening”
⇒ used with teachers, unfamiliar people, customers, supervisors, and in polite conversation
Still, Japanese response words also help manage the conversation. They can show that you are listening even when you have not yet reached a final decision.
Compare the Same Question
A：コーヒー飲む？
Do you want coffee?
B：うん、飲む。
Yeah, I do.
⇒ Casual and natural.
A：コーヒーを飲みますか。
Do you drink coffee?
B：はい、飲みます。
Yes, I do.
⇒ Polite and appropriate.
As a beginner, match polite speech with はい.
Why Do Japanese People Nod and Say Un?
To nod in Japanese is うなずく (unazuku), usually written 頷く.
unazuku
to nod
うなずき
unazuki
a nod; nodding
In Japanese conversation, a nod often appears together with an 相づち (aizuchi)—a short listener response such as うん, はい, ええ, へえ, or そうですか.
The National Institute for Japanese Language and Linguistics explains that nodding and backchannel responses can signal:
“I received what you said.”
“I understand.”
“I am interested.”
“I agree or sympathize.”
A nod may mean “I’m following your story” rather than “I agree with your conclusion.”
Look at the words, tone, facial expression, and final response—not only the nod.
Three Main Uses of Un
1. Un as a Real “Yes”
When answering a clear question, うん may directly mean “yes” or “yeah.”
A：これ、君の？
Kore, kimi no?
Is this yours?B：うん、そうだよ。
Un, sō da yo.
Yeah, it is.
2. Un as “Okay” or Acceptance
It can show that you accept a plan or request.
A：じゃあ、6時に駅で会おう。
Jā, roku-ji ni eki de aō.
Then let’s meet at the station at six.B：うん、いいよ。
Un, ii yo.
Yeah, sounds good.
3. Un as an Aizuchi: “Uh-Huh, I’m Listening”
During a longer story, うん may simply keep the conversation moving.
Yesterday, I ran into an old friend at the station.
Uh-huh.
And then we decided to have dinner together—
Mm-hm, mm-hm.
Here, the listener is not answering a yes/no question. The response means “I’m following—go on.”
4. Un as Empathy: “I Know” or “I Get It”
A：新しい仕事って疲れるよね。
Atarashii shigoto tte tsukareru yo ne.
A new job is exhausting, isn’t it?B：うん、わかる。
Un, wakaru.
Yeah, I know what you mean.
Ask yourself whether the speaker is:
① answering a question,
② accepting a plan,
③ showing they are listening, or
④ expressing empathy.
Does a Japanese Nod Mean Yes?
A nod can show affirmation, understanding, acknowledgment, agreement, or consent. However, the meaning depends on the conversational moment.
Are you coming tomorrow?
Nod + うん。
Yeah.
⇒ A direct affirmative answer.
The speaker is still describing a problem.
Repeated nod + うん、うん。
Uh-huh, mm-hm.
⇒ “I’m listening.” It does not necessarily mean final agreement.
じゃあ、この方法でいい？
Then, is this method okay?
賛成ということでいいですか？
May I understand that you agree?
Un vs Uun vs Uun: うん, ううん, and うーん
These words look similar in romaji, but their meanings are very different.
yes; yeah; uh-huh
ううん (uun)
no; nope — casual
うーん (ūn)
hmm; let me think; I’m not sure
うん: “Yeah”
A：おなかすいた？
Are you hungry?B：うん。
Yeah.
ううん: Casual “No”
A：もう食べた？
Did you eat already?B：ううん、まだ。
No, not yet.
うーん: “Hmm…”
A：どっちがいい？
Which one is better?B：うーん、わからない。
Hmm…I’m not sure.
ううん starts with two separate vowel morae and means “no.”
うーん stretches the first sound and means “hmm.”
Learning the Japanese spelling is safer than relying only on romaji.
What Does Un Un Mean?
Romaji: un un
Common meanings: mm-hm; yes, yes; I know; I’m listening
Repeating うん often strengthens the listener-response feeling.
A：最近ちょっと忙しくて。
I’ve been a little busy lately.B：うんうん。
Mm-hm.
With a warm tone and nodding, it can show empathy. With fast repetition or an irritated face, it can sound impatient.
A calm うん、うん can sound supportive.
A quick うんうんうん before the speaker finishes may sound like “Yeah, yeah, I heard you.”
Un vs Hai as Aizuchi
Both うん and はい can be used as short listener responses.
うん。／うんうん。
Uh-huh. / Mm-hm.
Polite conversation:
はい。／はい、はい。
Yes. / I see. / I’m following.
A well-timed はい shows attention. But fast repeated はいはい can sound like “Okay, okay” or “Yeah, yeah” and may feel dismissive.
Un vs Hai When Answering Negative Questions
Negative questions can confuse English speakers.
In Japanese, the response usually confirms or rejects the statement contained in the question.
Ashita wa konai no?
Aren’t you coming tomorrow?
うん、行かない。
Yeah, I’m not going.
⇒ The negative statement is correct.
ううん、行くよ。
No, I am going.
⇒ The negative statement is incorrect.
In polite speech:
Aren’t you coming tomorrow?
はい、行きません。
That’s right, I’m not going.
いいえ、行きます。
No, I am going.
To avoid confusion, add the full answer:
うん、行かない or ううん、行く.
Do not rely on うん or ううん alone until the pattern feels natural.
Who Can You Use Un With?
・close friends
・family members
・a romantic partner
・children
・classmates who use casual speech
・close coworkers in an established casual relationship
うん is not a swear word or an offensive expression. The issue is simply that it belongs to casual speech.
However, every family has its own style, and some children are taught to answer adults with はい in serious situations.
When Should You Use Hai Instead?
・a teacher or instructor is speaking to you
・your name is called in class or at an appointment
・you are speaking to a customer
・you are answering a supervisor politely
・you are speaking to someone you have just met
・the rest of your sentence uses です／ます speech
・you want a clear, attentive response
先生：聞こえますか。
Sensei: Kikoemasu ka.
Can you hear me?学生：はい、聞こえます。
Gakusei: Hai, kikoemasu.
Yes, I can.
Friends may use it to sound especially clear, playful, obedient, formal for fun, or serious. It simply does not have the relaxed everyday feeling of うん.
How Tone Changes Un
うん。— Neutral Agreement
A calm falling tone often sounds like a simple “yeah.”
うん？— “Hm?” or “What?”
With rising intonation, it may show that the speaker did not hear, is surprised, or is inviting the other person to continue.
A：ねえ。
Hey.B：うん？
Hm? / Yeah?
うん！— Energetic “Yes!”
A bright, strong tone can show enthusiasm or a confident answer.
うん……— Hesitant Agreement
A slow response with a pause may sound uncertain or reluctant.
うん！ sounds confident.
うん……まあね。 sounds more like “Yeah…sort of.”
Un in Anime and Manga
Because anime characters often speak casually with friends, family, and teammates, うん appears frequently.
Yeah, let’s go!
うん、わかった。
Okay, got it.
うん？どうしたの？
Hm? What’s wrong?
ううん、なんでもない。
No, it’s nothing.
うーん、どうしよう。
Hmm, what should I do?
うんうん、そうだよね。
Mm-hm, I know what you mean.
It is highly conversational and depends strongly on tone, so beginners should first become comfortable with the clearer form うん.
Natural Example Sentences with Un
うん、そうだよ。
Un, sō da yo.
Yeah, that’s right.
うん、わかった。
Un, wakatta.
Okay, got it.
うん、行きたい。
Un, ikitai.
Yeah, I want to go.
うん、大丈夫。
Un, daijōbu.
Yeah, I’m fine. / Yeah, that’s okay.
うん、それで？
Un, sore de?
Uh-huh, and then?
うん、わかるよ。
Un, wakaru yo.
Yeah, I know how you feel.
うん？何か言った？
Un? Nanika itta?
Hm? Did you say something?
ううん、違うよ。
Uun, chigau yo.
No, that’s not right.
うーん、少し考えさせて。
Ūn, sukoshi kangaesasete.
Hmm, let me think about it.
うんうん、なるほど。
Un un, naruhodo.
Mm-hm, I see.
彼女は何も言わずにうなずいた。
Kanojo wa nani mo iwazu ni unazuita.
She nodded without saying anything.
彼は笑顔でうんとうなずいた。
Kare wa egao de un to unazuita.
He smiled, said “yeah,” and nodded.
Mini Conversations: Un or Hai?
Conversation 1: Close Friends
Do you want to watch a movie together tomorrow?
Yeah, let’s!
Conversation 2: Teacher and Student
Did you understand this problem?
Yes, I understood it.
Conversation 3: Listening to a Friend’s Story
Something difficult happened at work yesterday…
Mm-hm.
Conversation 4: Thinking Before Answering
Want to take a trip this weekend?
Hmm, I might be a little busy this week.
Common Beginner Mistakes
Mistake 1: Using Un in Polite Conversation
Did you understand?
△ うん。
Yeah.
⇒ Understandable but too casual in ordinary teacher–student speech.
○ はい、わかりました。
Yes, I understood.
Mistake 2: Assuming Every Nod Means Agreement
A nod or うん during a story may only show listening, understanding, or encouragement to continue.
Mistake 3: Confusing うん and うーん
うん is usually affirmative. うーん expresses thought, hesitation, or uncertainty.
Mistake 4: Pronouncing Un Like an English Prefix
Japanese うん is short and often nasal. It may sound closer to a compact “mm-hm” than the English prefix in unhappy.
Mistake 5: Overusing Aizuchi
Too little listener response may make a speaker wonder whether you are following. However, very rapid repeated うんうんうん can sound impatient. Timing, tone, facial expression, and nodding all matter.
Mistake 6: Answering a Negative Question with Un Alone
Add the full sentence so the meaning is clear:
Aren’t you coming tomorrow?
うん、行かない。
Right, I’m not going.
ううん、行くよ。
No, I am going.
FAQ About Un and Hai
What does un mean in Japanese?
うん (un) is a casual response meaning “yes,” “yeah,” “uh-huh,” “okay,” “I understand,” or “I agree,” depending on context.
What is the difference between un and hai?
Un is casual, while hai is polite or neutral. Use un with close people and hai in polite conversation.
Does un mean yes in Japanese?
Yes, it can directly mean “yes” or “yeah.” It can also work as a listener response meaning “uh-huh” without expressing complete agreement.
Why do Japanese people nod and say un?
Nodding and saying un can show that the listener is following, understands, agrees, or wants the speaker to continue. The exact meaning depends on the conversation.
Does a Japanese nod always mean yes?
No. A nod can mean “I’m listening” or “I understand what you are saying” without indicating final agreement.
Is un rude in Japanese?
It is not inherently rude, but it is casual. It may sound disrespectful with teachers, customers, unfamiliar people, or superiors.
Can I say un to a Japanese friend?
Yes. It is one of the most common casual ways to say “yeah,” “okay,” or “uh-huh” with friends.
Can I say hai to a friend?
Yes. It may sound more formal, clear, serious, playful, or obedient than the relaxed un, depending on tone.
What does un un mean?
うんうん often means “mm-hm,” “yes, yes,” or “I’m listening.” Warm delivery can show empathy, while fast repetition may sound impatient.
What is the difference between un and uun?
うん means “yes” or “yeah.” ううん is a casual “no.”
What is the difference between un and ūn?
うん is affirmative, while うーん means “hmm” and expresses thinking, hesitation, or uncertainty.
What does un with a rising tone mean?
うん？ can mean “Hm?”, “What?”, or “Yeah?” when the speaker did not hear, is surprised, or is inviting the other person to continue.
How do you say nod in Japanese?
The verb is うなずく／頷く (unazuku), meaning “to nod.” The noun is うなずき (unazuki).
Is un used in anime?
Yes. It is extremely common in casual anime dialogue, along with ううん for “no” and うーん for “hmm.”
Summary: Un vs Hai and the Japanese Nod
Casual “yes,” “yeah,” “uh-huh,” or “okay.”
Use it with friends, family, and people you speak casually with.
● はい (hai)
Polite or neutral “yes,” “I understand,” or “I’m listening.”
Use it in polite conversation and when your name is called.
● A nod does not always mean full agreement
It may show listening, understanding, acknowledgment, empathy, or encouragement to continue.
● うん and はい can both be aizuchi
They help show that the listener is participating in the conversation.
● ううん means “no”
It is the casual negative response.
● うーん means “hmm”
It shows thinking, hesitation, or uncertainty.
● うんうん means “mm-hm”
It can sound empathetic or impatient depending on timing and tone.
● The easiest beginner rule
Close friend ⇒ うん
Teacher or polite conversation ⇒ はい
First ask: Is the person answering, accepting, listening, empathizing, or thinking?
That question will help you understand natural Japanese conversation much more accurately.
Related Article
If you want to compare all the common ways to say “OK” and “yes” in Japanese in one place, see How to Say Okay in Japanese: 8 Natural Ways to Say OK and Yes.
References
- Kotobank: うん — dictionary meanings including understanding or accepting another person’s intention.
- Kotobank: はい — uses for polite response, affirmation, and answering when called.
- Kotobank: ううん — meanings including a casual negative response.
- National Institute for Japanese Language and Linguistics: How to Show You Are Listening — explains the conversational roles of nodding and backchannels and how timing can change their impression.
- National Institute for Japanese Language and Linguistics: Communicating with Japanese Learners — notes that Japanese speakers frequently use backchannels as signals of listening and understanding.
- National Institute for Japanese Language and Linguistics: うなずく — describes nodding as a gesture that may indicate affirmation, understanding, agreement, or acknowledgment.
- National Institute for Japanese Language and Linguistics: いいえ — includes an example of rejecting a negative statement with いいえ.