In a manner that chastens, humbles, or subdues; in a way that has a sobering or corrective effect.
From 'chastening' (adjective) plus the adverbial suffix '-ly,' creating a sophisticated word that describes the manner in which something humbles or corrects.
This word is most common in literary writing—when an author wants to show that something (like a defeat or setback) had a profound effect on a character's self-awareness, they'll use 'chasteningly.'
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