The Oxford Thesaurus An A-Z Dictionary of Synonyms - glassyadj.

1) shining, shiny, gleaming, smooth, slippery, slick, glossy, icy, mirror-like, US slick: We skidded on the glassy surface and crashed into a wall. 2) fixed, staring, trancelike, hypnotic, vacant, empty, expressionless, blank, void, vacuous, dazed, dull, glazed, cold, lifeless: His glassy stare made me very uncomfortable.