In a canny or shrewd manner; with keen judgment or careful prudence (archaic or dialectal form).
From canny (meaning shrewd, knowing), likely from Scottish origin, plus -ly adverbial suffix. Related to 'can' in the sense of knowledge.
'Canny' comes from Scottish 'can' meaning knowledge—so a 'canny' person was literally 'knowing,' and Scottish traders became famous for their shrewd 'canniness'!
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