glassy
adj.looking like glass, or having a smooth, shiny surface. It can also describe a look in someone's eyes when they are tired or not paying attention.
adj.resembling glass in appearance or texture; having a smooth, transparent, or reflective surface. Often describes a physical surface or a vacant, unfocused expression in the eyes.
“The lake had a glassy surface this morning.”
“After working late all week, she had a glassy look in her eyes that suggested she was exhausted.”
“The artisan used a glassy finish on the sculpture to create a sense of depth, allowing light to refract through the layers of translucent resin.”
From Middle English glasy, equivalent to glass + -y. Compare Saterland Frisian glääsich (“glassy”), Dutch glazig (“glassy”), German Low German glasig (“glassy”), German glasig (“glassy”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.