slippery, slippy (adj)

causing or tending to cause things to slip or slide

"slippery sidewalks"; "a slippery bar of soap"; "the streets are still slippy from the rain"

slippery, tricky (adj)

not to be trusted

"how extraordinarily slippery a liar the camera is"- James Agee

slippery (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.

slippery (Adjective)

Evasive; difficult to pin down.