Superlative form of glassy: most glassy.(adjective)
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Use "glassiest" in a sentence
"In one way, this approach is refreshing: Mr. Norten chose not to present a design that contributes to New York's vertical arms race, in which builders strive to build the highest, sleekest, glassiest buildings possible."
"The Gulf was nearly dead calm, with only the smallest and glassiest of rollers crossing its surface like respiration."
"It's often those who live in the glassiest houses who are most inclined to throw stones to distract from the fragility of their own abodes."