LESSON NOTES · レッスンノート

N3How you sound · Sep 28, 2026

How to say "complain" in Japanese: 愚痴ぐち vs 文句もんく (and クレーム)

愚痴ぐち (guchi) is venting — grumbling to someone who's just going to listen and sympathize, with no expectation anything changes. 文句もんく (monku) is complaining with an edge, usually aimed at whoever's responsible, expecting them to do something. クレーム (kureemu) is a formal complaint to a business. English collapses all three into "complain."

Get this wrong and the mistake is social, not grammatical: tell your boss 文句もんく when you meant to vent with 愚痴ぐち to a friend, and you've accidentally escalated a harmless gripe into a confrontation.

The basics

愚痴ぐち: venting, with no expectation of change

愚痴ぐち (ぐち, guchi) is grumbling about something you can't fix, to someone who's there to listen, not solve it. It almost always pairs with こぼす (to spill) or 言いう (to say).

友達ともだちに仕事しごとの愚痴ぐちをこぼした。 — I vented to a friend about work. (casual, no expectation of a fix) 愚痴ぐちを言いうのは好すきじゃないけど、今日きょうは聞きいて。 — I don't like complaining, but listen today. (casual, asking for sympathy, not action)

愚痴ぐち is emotionally low-stakes for the relationship — venting 愚痴ぐち to a friend is a completely normal, healthy thing to do in Japanese social life, almost a genre of conversation on its own (愚痴ぐちを聞きく, "to listen to someone vent," is a recognized favor friends do for each other).

文句もんく: complaining with an edge, aimed at someone

文句もんく (もんく, monku) is sharper — it's a complaint with an implied target, often the person who caused the problem, and it usually carries at least a little confrontation.

彼かれはいつも文句もんくを言いっている。 — He's always complaining. (a bit critical of the person complaining, too) 文句もんくがあるなら直接ちょくせつ言いってください。 — If you have a complaint, say it to my face. (direct, a bit confrontational)

文句もんく doesn't require the complaint to be justified — 文句もんくが多おおい ("complains a lot") is a mild criticism of someone's personality, describing them as someone who nitpicks or grumbles about things in general.

The core difference in one line

愚痴ぐち asks for sympathy. 文句もんく asks — or demands — for something to change, or at least registers a grievance that someone should hear. Telling a friend 愚痴ぐち keeps things warm; telling your boss 文句もんく makes it a confrontation.

愚痴ぐちを言いうだけで、解決かいけつしようとは思おもっていない。 — I'm just venting; I'm not trying to actually solve it. (explicitly naming the 愚痴ぐち mindset) 文句もんくを言いうだけじゃなくて、ちゃんと相談そうだんしたほうがいい。 — Instead of just complaining, you should actually talk to someone about it properly. (pointing out that 文句もんく alone doesn't fix anything)

Beyond the basics

クレーム: the formal complaint to a business

クレーム (kureemu, from English "claim") is what you make to a company, shop, or service when something's actually wrong — a defective product, bad service, an error on a bill. It's the word on customer-service signs and internal training materials.

お客様きゃくさまからクレームが入はいった。 — A complaint came in from a customer. (formal, business context) クレーム対応たいおうは接客せっきゃく業ぎょうの大変たいへんな部分ぶぶんだ。 — Handling complaints is a tough part of service work. (business/work register)

クレーム is never used for a friend venting about their day — it's specifically a customer-to-business channel, with the implication that someone should take responsibility and fix something.

苦情くじょう: the even more formal cousin of クレーム

苦情くじょう (くじょう, kujou) is drier and more bureaucratic than クレーム — the word you'd see on a government hotline, a building management notice, or a formal complaints procedure.

近所きんじょから苦情くじょうが来きた。 — A complaint came in from the neighborhood. (formal, often about noise, nuisance, etc.) 苦情くじょう処理しょり窓口まどぐち — complaints handling counter (bureaucratic, official signage)

The rough hierarchy of formality: 愚痴ぐち (venting between friends) < 文句もんく (a personal, pointed complaint) < クレーム (a customer complaint to a business) < 苦情くじょう (an official grievance, often bureaucratic).

言い訳いいわけ and 反論はんろん — related but different

Two words that get confused with this set because they're also about pushing back verbally: 言い訳いいわけ (いいわけ, "excuse," justifying yourself rather than complaining about someone else) and 反論はんろん (はんろん, "counterargument," disagreeing with a point rather than griping about a situation).

それは言い訳いいわけにしか聞きこえない。 — That just sounds like an excuse. (言い訳いいわけ defends yourself, doesn't complain about others) その意見いけんに反論はんろんしたい。 — I want to argue against that opinion. (反論はんろん disputes an idea, not a person's behavior)

Neither of these is a synonym for complaining — they're adjacent concepts that show up in similar conversations. 言い訳いいわけ also comes with a polite cushion, 言い訳いいわけになりますが ("this may sound like an excuse, but"), and excuse in Japanese shows why it follows the apology rather than opening it.

Why anime characters "complaining" often sounds like 愚痴ぐち, not 文句もんく

A huge amount of slice-of-life anime dialogue is characters venting to each other about school, work, or relationships — and almost all of it is 愚痴ぐち, not 文句もんく, because the point of the scene is bonding through shared frustration, not resolving anything (the same private-vs-public instinct behind honne and tatemae). If a character is actually confronting someone — a rival, a boss, an antagonist — that's when 文句もんく or even クレーム-flavored language shows up instead, closer to how to disagree politely in Japanese.

Common mistakes

  • Using 文句もんく when you just mean venting to a friend. 友達ともだちに文句もんくを言いった sounds sharper and more personal than 友達ともだちに愚痴ぐちを言いった — it makes the friend sound like the target of your complaint, not just the listener.
  • Using 愚痴ぐち for a real complaint to a business. 店みせに愚痴ぐちを言いった is odd — a business doesn't want to hear you vent, they want a クレーム they can act on, or at minimum 文句もんく that names the problem.
  • Assuming 文句もんくが多おおい is neutral. It's mildly critical — it describes someone as a chronic complainer, not just "a person who has complaints."
  • Mixing up 言い訳いいわけ with complaining. 言い訳いいわけ defends your own behavior; it's not a version of 愚痴ぐち or 文句もんく at all, even though all three involve talking your way through a conflict.

Which word should you use?

Word Reading What it is Target Formality
愚痴ぐち ぐち Venting for sympathy A friend, listener Casual
文句もんく もんく A pointed personal complaint The person responsible Casual–neutral
クレーム クレーム A customer complaint A business/service Formal
苦情くじょう くじょう An official grievance An authority/institution Very formal
言い訳いいわけ いいわけ An excuse (not a complaint) Defending yourself Varies

FAQ

Is it rude to say someone 文句もんくが多おおい? Mildly — it's a genuine (if soft) criticism of their personality, similar to calling someone "a complainer" in English. Fine among friends, less fine to say to someone's face in a formal setting.

Can 愚痴ぐち ever be directed at the person who caused the problem? Not really — the moment you're venting to the person responsible, it stops being 愚痴ぐち (venting to a sympathetic listener) and becomes 文句もんく (a complaint aimed at them).

Is クレーム the same as a lawsuit or legal claim? No — despite coming from English "claim," クレーム in Japanese just means a customer complaint, with no legal weight implied. A legal claim is 訴訟そしょう (そしょう) or 請求せいきゅう (せいきゅう), completely different words.

What do you say if you want to complain about noise from a neighbor? 苦情くじょう is the standard word — 近所きんじょに苦情くじょうを言いう ("to complain to the neighbors") is the direct way, and 管理かんり会社かいしゃに苦情くじょうを言いう ("to complain to the building management") is the formal route for that kind of third-party grievance.

Is there a verb form for these, or do they all use 言いう? 愚痴ぐち uses こぼす or 言いう; 文句もんく uses 言いう; クレーム uses 入いれる (クレームを入いれる, "to file a complaint") or つける (クレームをつける); 苦情くじょう uses 言いう or 申もうし立たてる (formal, "to file/lodge").

How do you say "stop complaining" casually? 文句もんく言いうのやめて or もう愚痴ぐちやめて, depending on whether you're telling someone to stop being pointed/critical (文句もんく) or stop venting repeatedly (愚痴ぐち).

Practice

Answers are hidden — try your own sentence first, then open. Questions 3 and 4 use the same situation with 愚痴ぐち and 文句もんく to show the difference in target and tone.

1. "I vented to a friend about work." (casual, no expectation of a fix)

Show answer

友達ともだちに仕事しごとの愚痴ぐちをこぼした。 — 愚痴ぐち pairs naturally with こぼす.

2. "He's always complaining." (a bit critical of the person, too)

Show answer

彼かれはいつも文句もんくを言いっている。 — 文句もんく carries an edge that 愚痴ぐち doesn't.

3. "I'm just venting about my boss to you, not trying to fix anything." (to a friend, safe target)

Show answer

上司じょうしの愚痴ぐちをこぼしてるだけで、解決かいけつしようとは思おもってない。 — 愚痴ぐち to a friend, safely away from the boss.

4. "If you have a complaint, say it to my face." (directed at the responsible person)

Show answer

文句もんくがあるなら直接ちょくせつ言いってください。 — 文句もんく is aimed at the person who can act on it.

5. "A complaint came in from a customer." (formal, business)

Show answer

お客様きゃくさまからクレームが入はいった。 — クレーム is specifically customer-to-business. 苦情くじょう is also possible but sounds more official.

6. "A complaint came in from the neighborhood." (official, about noise)

Show answer

近所きんじょから苦情くじょうが来きた。 — 苦情くじょう is the more bureaucratic, official register.

7. Fix this: 店みせに愚痴ぐちを言いった。 (should be a formal complaint lodged with the shop)

Show answer

店みせにクレームを入いれた。 — a business wants a クレーム, not someone venting 愚痴ぐち. 店みせに文句もんくを言いった also works, but it is a personal complaint rather than a formal one.

8. "That just sounds like an excuse." (not a complaint at all)

Show answer

それは言い訳いいわけにしか聞きこえない。 — 言い訳いいわけ defends yourself; it's a different concept from complaining.

Use 愚痴ぐち for a harmless vent and 文句もんく for a real complaint, and test the line by venting about a bad day to a teacher in a trial lesson.

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.

愚痴	ぐち — venting, grumbling (for sympathy)
文句	もんく — a pointed complaint
クレーム	クレーム — a customer complaint
苦情	くじょう — an official grievance
言い訳	いいわけ — an excuse
反論	はんろん — a counterargument
こぼす	こぼす — to spill (used with 愚痴)
文句が多い	もんくがおおい — to be a chronic complainer
お客様	おきゃくさま — customer
申し立てる	もうしたてる — to file, to lodge (formal)

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, and 愚痴ぐち versus 文句もんく is one of those distinctions that quietly prevents a real social misstep — using the wrong one turns a harmless vent into an accusation without you meaning it to.

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

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