glassiest

/G L AE1 S IY0 AH0 S T/
adjective
  1. 1

    Of or like glass, especially in being smooth and somewhat reflective.

  2. 2

    Including a lot of glass.

  3. 3

    Dull; expressionless.

    โ€œthe glassy eyes of a person in a tranceโ€

  4. 4

    (of water) Lacking any chop; smooth and mostly flat.

Source: https://en.wiktionary.org/wiki/glassiest, https://en.wiktionary.org/wiki/glassy