Slippery

1. Unstable; changeable; mutable; uncertain; inconstant; fickle.
2. Not easily held; liable or apt to slip away.
3. Having the quality opposite to adhesiveness; allowing or causing anything to slip or move smoothly, rapidly, and easily upon the surface; smooth; glib; as, oily substances render things slippery.
4. Not affording firm ground for confidence; as, a slippery promise.
5. Wanton; unchaste; loose in morals.
6. Uncertain in effect.
7. Liable to slip; not standing firm.