〜くせに

知(し)っているくせに教(おし)えてくれない。

Shitte iru kuse ni oshiete kurenai.

He knows perfectly well and still will not tell me.

くせに carries open reproach — it accuses

子供(こども)のくせに生意気(なまいき)だ。

Kodomo no kuse ni namaiki da.

Cheeky, for a child.

The subject is nearly always someone else

のに よりも角(かく)が立(た)つので、場面(ばめん)を選(えら)びます。

Noni yori mo kado ga tatsu node, bamen o erabimasu.

It cuts deeper than のに, so it picks its moments.

Not for a superior or someone you do not know well