In a way that suggests someone has done something wrong; with a tone or manner that blames or finds fault.
From accusing (present participle of accuse) plus -ly adverbial suffix. The -ing form creates an adjective, and -ly converts it to an adverb describing manner.
Adverbs ending in -ingly often describe tone or manner, and 'accusingly' captures that specific vocal quality—the raised eyebrow, the pointed finger, the 'I know you did it' tone that's instantly recognizable across languages and cultures.
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