In an ambling manner; in a way that is slow, relaxed, and leisurely.
From ambling + -ly suffix to form an adverb. Rare form but grammatically regular.
This is such a rare word that even word databases might not have it, but it perfectly demonstrates how English lets us turn any action into an adverb by stacking suffixes—amble + ing + ly creates a word for moving in a slow, relaxed way.
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