In a heady manner; in a way that is intoxicating, dizzying, or characterized by excitement and thrills.
From 'heady' plus the adverbial suffix '-ly'. This adverb form allows 'heady' to modify verbs and other adjectives.
When people describe living 'headily' in the moment, they're describing a psychological state where you stop worrying about consequences—the same state that makes good artists great but bad decision-makers bankrupt.
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