奸笑

liǎn dài jiān xiào

脸带奸笑

have a sinister smile on one's face

wǒ men bǎ huài xiāo xi gào sù tā shí tā liǎn shang xiàn chū yī sī jiān xiào

我们把坏消息告诉他时，他脸上现出一丝奸笑。

He smirked unpleasantly when we told him the bad news.