glass·y / ˈglasē/ • adj. (glass·i·er, glass·i·est) 1. of or resembling glass in some way, in particular: ∎ having the physical properties of glass; vitreous: glassy lavas. ∎ (of water) having a smooth surface. ∎ (of sound) resembling the sharp or ringing noise made when glass is struck: a glassy clink. ∎ (of a building) having glass walls.2. (of a person's eyes or expression) showing no interest or animation; dull and glazed.DERIVATIVES: glass·i·ly / ˈglasəlē/ adv.glass·i·ness n.