In a gurgling manner; with gurgling sounds; in a way that produces soft, bubbling noises.
From 'gurgling' (the present participle of 'gurgle') plus the adverbial suffix '-ly,' creating an adverb that describes how an action is performed with gurgling sounds.
Adverbs like 'gurglingly' show how English speakers love to describe actions with onomatopoeia—it's more vivid to say someone spoke 'gurglingly' than just to say they made strange sounds.
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