In a couth, sophisticated, or refined manner; with good manners and elegance.
Formed from 'couth' or 'couthie' with the adverb suffix '-ly,' creating an adverbial form that modifies actions or behaviors.
Couthily is almost never used because 'couth' itself sounds slightly invented and humorous, so adding '-ly' to make it describe how you'd do something makes it even more tongue-in-cheek.
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