adjectives
resembling glass in smoothness and shininess and slickness
"the glassy surface of the lake"; "the pavement was...glassy with water"- Willa Cather
is similar to
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"
(used of eyes) lacking liveliness
"empty eyes"; "a glassy stare"; "his eyes were glazed over with boredom"
(of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it
"glazed pottery"; "glassy porcelain"; "hard vitreous china used for plumbing fixtures"