In a dandiacal manner; with excessive attention to dress and appearance typical of a dandy.
From 'dandiacal' plus the adverbial suffix '-ly,' creating an adverb that describes actions or behavior in a dandiacal way.
This 19th-century adverb is so specific that it's almost never used today, but it perfectly captures the exasperation Victorians felt with young men who cared too much about fashion!
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