你在她困难的时候抛弃她，真是太差劲了。

It's too bad of you to desert her in trouble.

《新英汉大辞典》

我变得很生气，大声对她吼道：“你太差劲了，你正在浪费你爸爸的钱！”

So I became angry and scolded her loudly, "you are not good. And you are wasting your father's money."

youdao