Particle KUSE NI (くせに)

The particle KUSE NI is translated as “even though, despite the fact that”, and conveys a feeling of contempt, despise, disdain, or other negative feelings.

彼はまじめに働かないくせに、高い給料をもらっている。

かれはまじめにはたらかないくせに、たかいきゅうりょうをもらっている。

Despite the fact that he doesn’t take his work seriously, he gets a big paycheck.

The particle KUSE NI can also appear at the end of a sentence. The whole meaning is actually understated and a feeling of contempt is conveyed ("You give advice to others, but you don't know yourself", "You pretend you don't know, but you do know the truth", etc.)

あなたも知らないくせに・・・

あなたもしらないくせに・・・

As if you don’t know…

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Particle KUSE NI (くせに)