Shining with a bright, harsh light that's painful or unpleasant to look at; glaring or dazzling in an uncomfortable way.
From 'glare' (Middle English glaren, possibly from Proto-Germanic *glerōnan) + '-y' (adjective-forming suffix). The root originally meant to shine brightly or stare intensely.
Before sunglasses were invented, 'glary' was probably the most important word for describing why outdoor work was so miserable on sunny days—it's not just bright, it's aggressively, painfully bright!
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