In a manner that shows deep sadness, sorrow, or the act of grieving.
Combines 'grieving' (the present participle of 'grieve') with the adverbial suffix '-ly,' which comes from Old English 'liche' meaning 'body' or 'form,' eventually generalizing to mean 'in the manner of.'
Adding '-ly' to create adverbs is one of English's most productive word-building tricks—you can turn almost any adjective into an adverb this way, which is why English allows speakers to create new adverbs on the fly that everyone still understands.
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