In a way that is socially acceptable, properly respectful, or of reasonably good quality.
From 'decent,' which comes from Latin 'decens' meaning fitting or appropriate (related to 'decorum'). The -ly suffix converts the adjective to an adverb.
The word 'decent' is one of those quiet foundations of civilization—it means recognizing what's fitting and appropriate in human interaction. When someone says another person 'treated me decently,' they're saying something profound about respect and basic human dignity.
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