In a manner that is empty, sad, and lonely; in a way that suggests abandonment or profound emptiness.
From 'desolate' (adjective) plus the adverbial suffix '-ly'. The adverb form allows 'desolate' to modify verbs and describe how actions are performed.
When a writer uses 'desolately' to describe an action—like 'she desolately stared out the window'—it adds an emotional weight that simple 'sadly' can't quite capture.
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