glassy

adjective, glass·i·er, glass·i·est.

1. resembling glass, as in transparency or smoothness.
2. expressionless; dull: glassy eyes; a glassy stare.
3. of the nature of glass; vitreous.

noun, plural glass·ies.

4. Also glassie. Marbles. a marble used as a shooter.

adjective glassier or glassiest

1. resembling glass, esp in smoothness, slipperiness, or transparency
2. void of expression, life, or warmtha glassy stare