Adj. | 1. | slippy - 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" smooth - having a surface free from roughness or bumps or ridges or irregularities; "smooth skin"; "a smooth tabletop"; "smooth fabric"; "a smooth road"; "water as smooth as a mirror" |