In a dark, gloomy, or menacing way; with dark or evil intent.
From black (adjective, originally referring to color, metaphorically extended to evil or gloom) + -ly (adverb-forming suffix). This usage reflects ancient associations between darkness and moral evil.
Literature uses 'blackly' to describe comedy that's darkly funny — think of gallows humor or satire about terrible situations, where the word itself captures that paradoxical blend of darkness and wit.
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