Answer: glassiest

AnswerCrossword Clue
GLASSIESTMost expressionless
GLASSIESTMost transparent
GLASSIESTMost vitreous
glassiest(of water) Having a smooth surface
glassiestOf or resembling glass in some way, in particular
glassiestGLASSY, resembling glass
glassiest(of a building) Having glass walls
glassiest(of sound) Resembling the sharp or ringing noise made when glass is struck
glassiest(of a person's eyes or expression) Showing no interest or animation; dull and glazed
glassiestHaving the physical properties of glass; vitreous