The Collaborative International Dictionary
Glassily
Glassily \Glass"i*ly\, adv. So as to resemble glass.
Wiktionary
glassily
adv. In a glassy manner
Usage examples of "glassily".
They fumbled for a bit, him staring intently at the sofa cushion beside her head and her gaping glassily up at the ceiling, but they apparently got it in, because his pale, wrinkled butt started plunging up and down, his slight paunch slapping meatily into her massive one.
The two girls were staring glassily at him, and the calculus student in the corner was dozing over his ale.