In a manner showing certainty, self-assurance, or bold trust in one's abilities or circumstances.
From Latin 'confidere' meaning 'to trust fully,' composed of 'con-' (with) and 'fidere' (to trust). The English adverb form developed in the 16th century, reflecting the idea of acting with complete faith in oneself.
Confidence is often more about how others perceive us than our actual abilities - studies show people judge confident speakers as more credible even when they're wrong. The adverb form captures this performative aspect of certainty.
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