In a Byronic manner; with passionate intensity, dark romanticism, and emotional complexity.
From 'byronic' + the adverb suffix '-ally'. It transforms the adjective into an adverb describing how something is done in a Byronic style.
When a writer describes a character acting 'byronically,' they're painting a picture instantly—moody, passionate, dramatic—which shows how one person's distinctive style can become a shorthand for an entire emotional palette.
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