In a gaunt manner; with a thin, hollow, or desolate appearance or quality.
Gaunt with the adverbial suffix -ly, transforming the adjective into an adverb. This is the standard English method for creating adverbs from adjectives.
The suffix -ly is one of English's most productive tools for making adverbs—it can attach to nearly any adjective, letting us describe how actions happen or things appear.
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