in a way that is bright and harsh to the eyes, or in an obviously conspicuous manner.
From 'glary' (adjective) plus the adverb-forming suffix '-ly.' 'Glary' comes from 'glare,' related to Old Norse 'glarra' (to gleam).
If something is 'glarily obvious,' it's so bright and obvious that you literally can't miss it—like staring directly at the sun, you have no choice but to notice!
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