In a manner that shows trust and confidence; in a way that confides or reveals secrets.
From confiding (present participle of confide) + -ly adverb suffix. The -ing form creates an adjective (confiding, trusting), then -ly converts it to an adverb.
This adverb beautifully captures the *manner* of being vulnerable—someone speaking confidingly isn't just sharing information, they're doing it with a tone of trust, which changes everything about how the listener should respond.
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