adjective

• 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.
• (figuratively, by extension) Evasive; difficult to pin down.
• (obsolete) Liable to slip; not standing firm.
• Unstable; changeable; inconstant.
• (obsolete) Wanton; unchaste; loose in morals.