In a funereal manner; with a gloomy, somber, or mournful character.
Funereal + -ly (Old English adverbial suffix). The -ly suffix converts adjectives into adverbs by adding the meaning 'in the manner of' or 'having the quality of.' This standard English word formation has been productive since Old English times.
Adverbs ending in -ly are so common in English that we barely notice them, but they're one of our most efficient word-building tools—just add -ly to almost any adjective and you've created a new way to describe how something happens, which is why English can form thousands of adverbs instantly.
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