In a cussed manner; stubbornly, irritatingly, or with evident annoyance or spite.
From cussed plus the adverbial suffix -ly. Formed as an adverb to describe how something is done in a stubborn or annoying way.
Using 'cussedly' makes 'stubbornly' sound angrier—it suggests someone is being difficult not just by accident but with actual spite, like they're cursing as they do it!
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