How to Say No Problem in Japanese: Daijōbu, Mondai Nai and Ii Yo

"No problem" in English covers a request, a thank-you and an apology. Japanese uses a different phrase for each, and picking the right one is what makes you sound natural.

What you need to know

How to Say No Problem in Japanese: Daijōbu, Mondai Nai and Ii Yo

The phrase learners reach for first is daijōbu, "it's fine", and it does cover a lot: reassuring someone after an apology, saying you are all right, and agreeing that something works. Mondai nai and mondai arimasen are the literal "no problem", more matter-of-fact and useful for confirming that a plan or request is fine. Ii yo is the casual "sure, go ahead", kamaimasen is the polite "I don't mind", and ki ni shinaide means "don't worry about it" after an apology. When someone thanks you, Japanese usually avoids no problem altogether and uses iie or dō itashimashite, or plays it down with tondemonai desu. This guide sorts these phrases by situation, explains the tone and gestures that go with them, and covers the classic trap: daijōbu desu can also mean "no, thank you".

Daijōbu reassures after an apology and can also mean no thanks

Mondai arimasen confirms a plan or request is fine

Ii yo and kamaimasen give permission: sure, I don't mind

Reply to thanks with iie or tondemonai, not mondai nai

Daijōbu: the all-purpose it's fine

大丈夫 (daijōbu) means fine, all right, or safe. It is the most versatile answer when someone checks on you, apologises, or asks whether something works. Daijōbu? with a rising tone asks "are you OK?", and daijōbu with a falling tone answers "I'm fine" or "it's fine".

In polite speech, say daijōbu desu. To sound warmer, add a softener: daijōbu desu yo, "it's really fine", reassures someone who looks worried. Zenzen daijōbu, completely fine, is common in casual speech.

Mochi, Unihongo's mascot, guides a Japanese learning map for How to Say No Problem in Japanese: Daijōbu, Mondai Nai and Ii Yo: 大丈夫, 全然, 時間.
A visual learning path for How to Say No Problem in Japanese: Daijōbu, Mondai Nai and Ii Yo, with three key Japanese study points.
JapaneseRomajiMeaning
大丈夫?Daijōbu?Are you OK?
大丈夫。Daijōbu.I'm fine. / It's fine.
大丈夫ですよ。Daijōbu desu yo.It's really fine. (reassuring)
全然大丈夫!Zenzen daijōbu!Totally fine!
時間は大丈夫ですか。Jikan wa daijōbu desu ka.Are you OK for time?
三時で大丈夫です。Sanji de daijōbu desu.Three o'clock is fine.

Daijōbu desu as no, thank you

The most confusing use of daijōbu for learners is as a refusal. When a shop assistant asks fukuro wa go-riyō desu ka, would you like a bag, and you say daijōbu desu, it means you do not need one. The same applies when a host offers more food or someone offers to help carry something.

Tone and gesture make the meaning clear. A refusal usually comes with a small smile and a light wave of the open hand in front of the face or chest. To be explicit, say daijōbu desu, arigatō gozaimasu, or use kekkō desu, which is a clearer, slightly firmer no thank you.

JapaneseRomajiMeaning
袋は大丈夫です。Fukuro wa daijōbu desu.I don't need a bag.
大丈夫です、ありがとうございます。Daijōbu desu, arigatō gozaimasu.I'm fine, thank you.
結構です。Kekkō desu.No, thank you. (firmer)
もうお腹いっぱいなので、大丈夫です。Mō onaka ippai na node, daijōbu desu.I'm full, so I'm fine.

Mondai nai and mondai arimasen: literally no problem

問題ない (mondai nai) is the literal "no problem". It sounds matter-of-fact and slightly confident, and is best for confirming that a plan, schedule or request causes no difficulty. With friends, mondai nai or mondai nashi is fine; with colleagues, use mondai arimasen; with clients, mondai gozaimasen is the most formal.

Mondai nai is not used to reply to thanks, and it can sound a little cool as a reply to an apology, since it focuses on the facts rather than feelings. For apologies, daijōbu or ki ni shinaide is warmer.

JapaneseRomajiMeaning
問題ないよ。Mondai nai yo.No problem. (casual)
問題ありません。Mondai arimasen.No problem. (polite)
特に問題ございません。Toku ni mondai gozaimasen.There is no particular problem. (formal)
日程の変更は問題ありません。Nittei no henkō wa mondai arimasen.Changing the schedule is no problem.
何か問題ありますか。Nanika mondai arimasu ka.Is there any problem?

Ii yo, kamaimasen and dōzo: sure, go ahead

When someone asks a favour or permission, the natural no problem is a yes. With friends, いいよ (ii yo), "sure", is the everyday answer, often doubled: ii yo, ii yo. In polite speech, いいですよ (ii desu yo) or 構いません (kamaimasen), "I don't mind", work well.

どうぞ (dōzo), "please, go ahead", is the reply when someone asks to use, take or do something, like sitting in the seat next to you or passing through. With a small open-hand gesture towards the seat or doorway, it needs no other words.

JapaneseRomajiMeaning
いいよ。Ii yo.Sure. / No problem.
いいですよ。Ii desu yo.Sure, that's fine. (polite)
構いませんよ。Kamaimasen yo.I don't mind at all.
どうぞ。Dōzo.Go ahead.
もちろんです。Mochiron desu.Of course.
全然いいよ。Zenzen ii yo.Totally fine. (casual)

Responding to apologies

When a friend says gomen, the most natural replies are ii yo, daijōbu or 気にしないで (ki ni shinaide), "don't worry about it". Politely, say daijōbu desu yo or 気にしないでください (ki ni shinaide kudasai). To someone senior or a customer, お気になさらないでください (o-ki ni nasaranaide kudasai) is the respectful form.

In business, a client apologising for a delay may get a gracious iie, tondemo gozaimasen or a reassuring dō ka o-ki ni nasaranaide kudasai. Showing you are not upset matters more than the exact words, so smile and keep your tone light.

JapaneseRomajiMeaning
気にしないで。Ki ni shinaide.Don't worry about it.
いいよ、いいよ。Ii yo, ii yo.It's fine, it's fine.
大丈夫ですよ、気にしないでください。Daijōbu desu yo, ki ni shinaide kudasai.It's fine, please don't worry.
どうぞお気になさらないでください。Dōzo o-ki ni nasaranaide kudasai.Please don't concern yourself. (respectful)
お互い様ですよ。O-tagaisama desu yo.We're in the same boat. / It happens to all of us.

O-tagaisama is a lovely reply when someone apologises for a small inconvenience, such as a child making noise on a train. It means "we all need understanding sometimes". For more on apology language, see our guide to sumimasen and gomennasai.

Responding to thanks

English speakers often say no problem when thanked, but mondai nai sounds strange in reply to arigatō. Japanese replies play down the favour instead. いいえ (iie), "no", said once or twice, is the most common, and どういたしまして (dō itashimashite), "you're welcome", is correct but can sound slightly textbook in casual settings.

とんでもないです (tondemonai desu), "not at all", is humble and good for colleagues and people above you. Among friends, ii yo, ii yo or zenzen with a wave of the hand is natural. In business, kochira koso, "likewise", turns thanks back towards the other person.

They sayNatural replySituation
ありがとういいよ、いいよFriends
ありがとうございますいいえEveryday polite
助かりましたとんでもないですColleague, senior
ありがとうございましたこちらこそBusiness, mutual help
すみません、わざわざいえいえ、大丈夫ですSomeone who feels they troubled you

Tone, gestures and reading the reply

The hand wave matters. Waving the open hand side to side in front of your face means "no, no, not at all" and often goes with iie, iie or tondemonai. It is used both to refuse an offer and to wave away thanks. A small nod with ii desu yo signals permission.

Be careful with your own tone. A flat, clipped daijōbu can sound as if you are upset and pretending not to be. A slightly higher, lighter daijōbu daijōbu with a smile sounds sincere. Likewise, if a Japanese speaker says daijōbu desu with hesitation, a pause or a strained smile, they may be being polite; it can be worth asking again gently: hontō ni daijōbu desu ka?

  • Open hand waving in front of the face: no, not at all.
  • Small bow with iie: modest reply to thanks.
  • Open palm towards a seat or doorway with dōzo: please go ahead.
  • Hesitant daijōbu with a pause: possibly not fine; check kindly.

Common mistakes

  • Saying mondai nai in reply to thanks. Use iie, dō itashimashite or tondemonai desu.
  • Answering an offer with daijōbu desu when you mean yes. Say onegai shimasu.
  • Using ii yo or mondai nai with a client or manager. Use kamaimasen, mondai arimasen or kashikomarimashita.
  • Replying to a heartfelt apology with just mondai arimasen. Add warmth with daijōbu desu yo or ki ni shinaide kudasai.
  • Assuming daijōbu always means yes. Check the context: it is often a polite no.
Key points

A practical way to improve

Say no problem in five situations out loud: a friend apologising for being late (ii yo, ki ni shinaide), a colleague asking to move a meeting (mondai arimasen), a stranger asking to sit next to you (dōzo), a client thanking you (tondemonai desu) and a shop assistant offering a bag you don't need (daijōbu desu, with a small wave of the hand). Then ask your AI Sensei in Unihongo's immersive 3D classroom to apologise and thank you in different ways so you can respond without hesitating. The Apologise to a Neighbour mission is also useful in reverse: ask the AI Sensei to play the neighbour and practise accepting an apology graciously.

  1. 1

    Choose one clear goal

    Focus each session on a situation or skill you can actually use.

  2. 2

    Practice actively

    Say complete answers aloud instead of only reading or recognizing Japanese.

  3. 3

    Review and repeat

    Keep useful corrections and revisit the same skill until it feels natural.

FAQ

Frequently asked questions

What is the most common way to say no problem in Japanese?

Daijōbu, or daijōbu desu politely, is the most common all-round phrase. For confirming that a request or plan works, mondai arimasen is common too. With friends, ii yo is often the most natural reply to a small request.

How do I say no problem when someone thanks me?

Japanese usually does not say no problem here. Say iie, iie, or dō itashimashite, or play it down with tondemonai desu, "not at all". Among friends, ii yo, ii yo or ki ni shinaide works. Mondai nai in reply to thanks sounds odd.

Can daijōbu desu mean no?

Yes. When someone offers something, such as a bag at a shop or a second helping, daijōbu desu usually means "I'm fine, no thank you". It is a soft refusal, and your tone and a small hand gesture make the meaning clear.

Is mondai nai rude?

Mondai nai is plain and casual, fine with friends. With colleagues or strangers, use mondai arimasen. To clients, mondai gozaimasen or a more specific answer such as sore de daijōbu desu sounds more polished.

What does ki ni shinaide mean?

It means "don't worry about it", literally "don't let it weigh on your mind". It is the natural reply to a friend's apology. The polite version is o-ki ni nasaranaide kudasai.

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