In a dowdy, drab, or unfashionable manner; in a way characteristic of a frump.
From 'frumpy' with the adverbial suffix '-ly' (from Old English -lice, meaning 'in the manner of'). The '-ly' suffix converts adjectives into adverbs describing how something is done.
The '-ly' suffix is so productive in English that we can turn almost any adjective into an adverb—'beautifully,' 'frantically,' 'frumpily'—but it's actually declining in spoken English, where people increasingly just use the adjective form instead ('that dress is frumpy' rather than 'she dresses frumpily').
Adverbial form that carries forward the gendered judgment of 'frump,' often used to describe how women dress or present themselves.
Use sparingly and only to describe clothing choices, not to judge people; avoid moralizing.
["unfashionably","without regard to style"]
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