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.