〜くせに means "even though / despite," and on paper it looks like a twin of のに. But where のに merely flags that a result broke your expectation — and can even be pleasant surprise — くせに is never neutral and never kind. It is のに with a sneer. It accuses a person of an inconsistency and looks down on them for it: "you, who are/do X, have no business doing Y." Because the whole point is to pass judgment on someone, くせに almost always keeps the same (usually human) subject across both clauses, and it lives entirely in informal, critical speech — a jab, a taunt, a complaint. You would never use it about the weather, and you must never use it to a superior. If のis the raised eyebrow, くせに is the curled lip.
The shape, and the linker
[ clause A about a person ] くせに、[ clause B that contradicts A — to their discredit ]
Clause A establishes what the person is or does; clause B exposes behaviour that clashes with A, and the whole sentence blames them for the clash. Formation mirrors のに: a noun takes の, a na-adjective takes な, and i-adjectives and verbs attach in plain form.
| Preceding word |
|
|---|---|
| verb | 知っているくせに / 出来ないくせに |
| i-adjective | 若いくせに (no な) |
| na-adjective | 下手なくせに |
| noun | 子供のくせに |
何も知らないくせに、偉そうに言うな。
nani mo shiranai kuse ni, erasō ni iu na
Don't talk down to me when you don't know the first thing about it.
下手なくせに、練習もしない。
heta na kuse ni, renshū mo shinai
He's terrible at it, and yet he won't even practise.
お金があるくせに、けちだ。
o-kane ga aru kuse ni, kechi da
He's got money, yet he's a total cheapskate.
The heart of it: blaming a person for inconsistency
Every くせに sentence contains an accusation of hypocrisy or unfitness. The speaker points at a mismatch within one person — between what they are (or claim, or should be) and what they actually do — and holds it against them. This is why the subject stays constant: you're indicting one individual, not contrasting two situations.
Scorn at pretension — you have no standing to act this way:
自分では何もしないくせに、文句ばかり言っている。
jibun de wa nani mo shinai kuse ni, monku bakari itte iru
He does nothing himself, yet all he does is complain.
Contempt at hidden knowledge — you know perfectly well:
本当は知っているくせに、教えてくれないなんてひどい。
hontō wa shitte iru kuse ni, oshiete kurenai nante hidoi
You actually know, yet you won't tell me — that's just mean.
A jab at a mismatch of age or status:
子供のくせに、生意気なことばかり言う。
kodomo no kuse ni, namaiki na koto bakari iu
He's just a kid, yet he's forever saying cheeky things.
The trailing くせに: reproach left hanging
Like のに, くせに can end a sentence with the main clause swallowed, and the effect is pure, undiluted reproach. The listener already knows what they did; the dangling くせに is the accusation itself.
自分だってできないくせに。
jibun datte dekinai kuse ni
And you can't even do it yourself.
偉そうに。何も分かっていないくせに。
erasō ni. nani mo wakatte inai kuse ni
Look at him, so smug — when he doesn't understand a thing.
Between close friends or couples, a trailing くせに can soften into teasing rather than genuine attack — the same "oh, admit it" energy as an affectionate poke.
本当は嬉しいくせに。
hontō wa ureshii kuse ni
You're actually pleased about it — admit it.
Register: informal, personal, and often rude
くせに is informal and pointed. It is fine among peers, in an argument, or in the mouth of a character in fiction, but it is out of bounds toward anyone you owe respect — a boss, a client, a teacher, a stranger. Directed upward it sounds insolent; directed at a group or an abstraction it sounds simply wrong. Some fixed uses, like the old scolding 男のくせに ("call yourself a man?"), now strike many speakers as dated and judgmental — recognize them, but wield the pattern with care.
お金持ちのくせに、寄付一つしようとしない。
o-kanemochi no kuse ni, kifu hitotsu shiyō to shinai
He's rich, yet he won't so much as make a single donation.
偉そうに指図するくせに、自分は一度も現場に来ない。
erasō ni sashizu suru kuse ni, jibun wa ichido mo genba ni konai
He barks out orders, yet he's never once shown up on site himself.
Common mistakes
Mistake 1 — Using it with different subjects. くせに indicts one person; a contrast between two different subjects (or between a thing and a person) needs のに or けど.
❌ 天気がいいくせに、出かけたくない。
Wrong — the weather and 'I' are different subjects, and you can't reproach the weather. Use のに: 天気がいいのに、出かけたくない。
✅ 天気がいいのに、出かけたくない。
tenki ga ii noni, dekaketaku nai
The weather's nice, and yet I don't feel like going out.
Mistake 2 — Using it toward a superior or in a polite setting. Grammatically possible, socially disastrous — it insults the person. Switch to のに.
❌（上司に）お忙しいくせに、来てくださってありがとうございます。
Rude — くせに sneers at the person, so this insults your boss. A respectful 'even though' is のに: お忙しいのに…
✅ お忙しいのに、来てくださってありがとうございます。
o-isogashii noni, kite kudasatte arigatō gozaimasu
Thank you for coming even though you're so busy.
Mistake 3 — Using it for a neutral, blameless surprise. If there's no person to fault — just an unexpected result — くせに has nothing to sneer at. Use のに.
❌ 薬を飲んだくせに、なかなか治らない。
Wrong — there's no one to blame for the medicine not working. Neutral surprise takes のに: 薬を飲んだのに、なかなか治らない。
✅ 薬を飲んだのに、なかなか治らない。
kusuri o nonda noni, nakanaka naoranai
Even though I took the medicine, it just won't get better.
Mistake 4 — Dropping the の / な linker. A noun needs の and a na-adjective needs な, exactly as with のに.
❌ 下手くせに、文句だけは一人前だ。
Wrong — a na-adjective needs な: 下手なくせに. (And a noun needs の: 子供のくせに.)
✅ 下手なくせに、文句だけは一人前だ。
heta na kuse ni, monku dake wa ichininmae da
He's hopeless at it, yet when it comes to complaining he's second to none.
Key takeaways
- くせに = のに + a sneer: the same "even though" concession, but it always blames a person for an inconsistency ("you, who are/do X, shouldn't be doing Y").
- It normally needs the same (human) subject in both clauses — you're indicting one individual, not contrasting two situations.
- It is strictly informal and critical; never use it toward a superior, and never for a neutral, blameless, or self-directed surprise — that's のに's job.
- Linker: noun + の (子供のくせに), na-adjective + な (下手なくせに); i-adjectives and verbs attach plain.
- A trailing くせに (自分だってできないくせに。) is pure reproach — or, between intimates, affectionate teasing.
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- のに: Although (Unexpected Result)N4 — のに means 'even though', but unlike neutral けど it always editorializes — it flags that the result violated the speaker's expectation, carrying surprise, frustration, or regret; with のに the emotion is built into the grammar.
- 〜ても: Even If / Even ThoughN3 — How te-form + も builds the concessive 'even if / even though' — the Y clause holds despite X — spanning hypothetical and factual cases, extending to adjectives and nouns, and underlying the permission pattern 〜てもいい.
- けど / けれど / けれども: Spoken 'but'N4 — The けど family is one connector at three politeness levels — casual けど, neutral けれど, formal けれども — the everyday spoken counterpart of written が, and けど doubles as a trailing softener that leaves a request or opinion politely unfinished.