In a manner that reveals or demonstrates something clearly; in a way that shows evidence.
From 'evincing' (present participle of 'evince') plus the adverbial suffix '-ly.' This rare adverbial form emphasizes the demonstrative quality of an action.
This is a rare adverb form showing how language creates layers of meaning—'evincingly' describes the manner of revelation itself, like saying 'in a way that proves something.'
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