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adj. glass·i·er, glass·i·est
1. Characteristic of or resembling glass.
2. Lifeless; expressionless: "the face changing to a demon's face with a fixed glassy grin" (Katherine Anne Porter).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.