In a manner characteristic of byways or remote places; in a way that is off the main route or away from ordinary paths (archaic).
From 'byous' + '-ly' suffix, creating an adverb that describes actions or situations occurring in the manner of byways or secondary locations.
By adding '-ly' to an already archaic adjective 'byous,' we get 'byously'—a triple-layered old word that probably hasn't been used since people actually relied on byways for travel!
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