Etymology
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glassy (adj.)

late 14c., from glass (n.) + -y (2). From early 15c. in reference to the eye, etc., "fixed and expressionless."

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Definitions of glassy

glassy (adj.)
resembling glass in smoothness and shininess and slickness; "the pavement was...glassy with water"- Willa Cather;
the glassy surface of the lake
glassy (adj.)
(used of eyes) lacking liveliness;
a glassy stare
Synonyms: glazed
glassy (adj.)
(of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it;
glassy porcelain
Synonyms: vitreous / vitrified
From wordnet.princeton.edu