smooth as glass (adjective) icy: frozen; slippery when frozen
Sinonime: algific, antarctic, arctic,
biting,
bitter,
chill, chilled to the bone,
chilling,
chilly,
cold,
freezing,
frigid, frigorific, frost-bound, frosty, frozen over, gelid, glacial, glaring, iced, polar,
raw, refrigerated, rimy, shivering, shivery, sleeted, smooth as glass
Antonime: unfrozen,
watery