In an audacious manner; with bold, daring, or recklessly confident behavior.
From 'audacious' (bold, daring) with the adverbial suffix '-ly', which turns adjectives into adverbs. Ultimately from Latin 'audax' (bold) via 'audacious'.
English's '-ly' suffix is so productive that we can add it to almost any adjective to turn it into an adverb—'audaciously,' 'ridiculously,' 'unfortunately'—it's one of English's most useful tools for describing HOW something happens!
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