她经常在背后说别人的坏话。

She often says ___nasty things about people behind their backs.

他讲了一个刻薄的笑话，让大家都感到不安。

He told a ___nasty joke that upset everyone.

当她需要帮助时他忽视了她，这很刻薄。

It was ___nasty of him to ignore her when she needed help.