In a downright manner; in a thoroughly, bluntly, or frankly straightforward way.
From 'downright' (down + right, meaning completely and utterly) plus '-ly' adverb suffix. 'Downright' dates to Middle English (14th century) and originally meant 'absolutely' or 'completely.'
This is an archaic or rare adverb—most people would say 'downright' as both adjective and adverb ('that's downright rude'), rather than adding '-ly'. Language evolves to be more efficient!
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