In a manner that is angelic, innocent, or divine; with heavenly or pure qualities.
From 'angelical' (or 'angelic') plus the adverbial suffix '-ly', creating an adverb that describes how something is done or appears.
Adding '-ly' to adjectives to make adverbs is one of the most productive word-formation rules in English, and it works so reliably that you can make adverbs from almost any adjective—even invented ones.
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