In a gleamy manner; with brightness, shine, or a quality of gleaming.
From 'gleamy' plus the adverbial suffix -ly, transforming an adjective into an adverb that describes how an action is performed or how something appears.
Adverbs ending in -ly are so common that we barely notice them, but they're one of English's greatest gifts for precise description—'gleamily' lets you describe not just that something is bright, but HOW it shines.
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