In a manner that shows resistance or bold challenge to authority, rules, or expectations; defiantly.
From 'defying' (present participle of defy) plus '-ly,' the adverbial suffix. Defy comes from Old French 'defier,' meaning to renounce or challenge.
English adverbs ending in -ly can be made from almost any adjective or gerund form, creating a wonderfully flexible system—we can turn defiance into an adverb instantly.
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