In a manner characterized by noisy, quarrelsome, and petty arguing.
Adverbial form of brabbling, created by adding -ly to the present participle. The double suffix construction (-ing + -ly) is standard for creating adverbs from progressive verb forms.
This wonderfully specific adverb lets you describe exactly how certain people behave in meetings: not with legitimate debate, but brabblingly—noisily and pointlessly.
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