glassy
adjective
1 the glassy surface of the lake:
smooth, mirrorlike, glasslike, gleaming, shining, shiny, sheeny, glossy, polished;
slippery, slick, icy, ice-covered;
clear, crystal clear, transparent, translucent, limpid, pellucid;
calm, still, flat, unruffled, even, waveless, like a millpond;
informal slippy;
technical vitreous, hyaloid.
▷antonyms rough; murky.