1disembodied spirit; ghost; devil
2(suffix) person with a certain vice or addiction etc
3sly; crafty; resourceful (variant of 詭|诡)
4one of the 28 constellations of ancient Chinese astronomy
Examples
nǐ你kàn qǐ lai看起来jiù就xiàng像jiàn见guǐ鬼le了yí yàng一样。
你看起来就像见鬼了一样。
You look like you've just seen a ghost.
我非常怀疑我们看到的是鬼。
I very much doubt that what we saw was a ghost.
欧洲现在是不是还有很多人信鬼？
Are there many people in Europe who believe in ghosts even now?