Slippery

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.

Not affording firm ground for confidence; as, a slippery promise.

Not easily held; liable or apt to slip away.

Liable to slip; not standing firm.

Unstable; changeable; mutable; uncertain; inconstant; fickle.

Uncertain in effect.

Wanton; unchaste; loose in morals.