In a rude or unhelpful manner; while refusing to do someone a favor.
From disobling + -ly adverbial suffix. The -ly transforms the adjective into an adverb describing how an action is performed.
This adverb form shows how English once had much richer vocabulary for describing social behavior—we had words for the manner, the person, the action, and the quality. Modern English tends to simplify this with 'rudely' or 'unhelpfully.'
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