This means "even though" or "despite." You use it when you are upset or annoyed about something.
Verb [dictionary form] + くせにPrimary
い-Adjective + くせに
な-Adjective + な + くせに
Noun + の + くせに
This means "even though" or "despite." You use it when you are upset or annoyed about something.
知っているくせに、教えてくれないんだ。
You know, and yet you won't tell me!
いつも偉そうなことばかり言って。自分では何もできないくせに。
He's always saying such pompous things, even though he can't do anything himself.
本当は強くないくせに、いつも威張っていた。
Despite not actually being strong, he was always acting all high and mighty.
下手なくせに、やりたがるから困るんだよ。
It's a problem because he's bad at it, and yet he always insists on doing it.
大学生のくせに、こんな簡単な漢字も読めないのか。
You're a university student, and yet you can't even read a simple kanji like this?
This phrase shows strong negative feelings. It means you are upset or blaming someone. It's like saying, "How could you do that?" It is not a polite phrase. Only use it with close friends. Or use it when you want to criticize someone.
This is different from 'のに' (noni). 'のに' shows a simple surprise or regret. 'くせに' shows strong anger or blame. It means someone should have known better. It is also different from 'にもかかわらず' (ni mo kakawarazu). That phrase is formal and shows facts. 'くせに' is informal and shows strong feelings. 'わりに（は）' (wari ni wa) shows something is not as expected. But it does not blame anyone like 'くせに' does.
Don't use this when the two parts of the sentence have different subjects. For example, you wouldn't say "My friend is rich, but I'm poor." You also don't use it for things that aren't alive. It is for criticizing people or animals.
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