What is the meaning of Slippery?

Of a surface, having low friction, often due to being covered in a non-viscous liquid, and therefore hard to grip, hard to stand on without falling, etc.

Evasive; difficult to pin down.

Liable to slip; not standing firm.

Unstable; changeable; inconstant.

Wanton; unchaste; loose in morals.

Source: wiktionary.org