"glassiest" in the adjective sense
1. glassy
resembling glass in smoothness and shininess and slickness
"the glassy surface of the lake"
"the pavement was...glassy with water"- Willa Cather
2. glassy, glazed
used of eyes) lacking liveliness
"empty eyes"
"a glassy stare"
"his eyes were glazed over with boredom"
3. glassy, vitreous, vitrified
of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it
"glazed pottery"
"glassy porcelain"
"hard vitreous china used for plumbing fixtures"
Source: WordNet® (An amazing lexical database of English)
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