(of people) behaving secretly and often dishonestly, or (of actions) done secretly and often dishonestly

I saw him cast a furtive glance at the woman at the table to his right. 我看到他偷偷地扫了一眼坐在他右手桌子旁的女人。

He made one or two furtive phone calls. 他鬼鬼祟祟地打了一两个电话。

There was something furtive about his behaviour and I immediately felt suspicious. 他鬼鬼祟祟的，我马上觉得有些可疑。