In an asserting manner; in a way that makes strong claims or states things confidently.
From 'asserting' (present participle of 'assert') plus '-ly' (adverbial suffix). Creates an adverb describing how an assertion is made.
This adverb performs a unique function: it lets you describe not just what someone said but how they said it—'assertingly' suggests confidence and boldness in delivery, not just content, showing how adverbs can layer meanings about both action and attitude.
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