The quality of talking too much or being overly talkative, especially in a way that is tiresome or excessive.
From Latin garrulus (talkative, chattering) combined with -ness suffix. The root garrulus likely imitated the sounds of constant chatter. The -ness suffix converts the adjective into an abstract noun.
Romans used garrulus to describe someone who literally wouldn't stop talking—like they were imitating chirping birds. It's a word that sounds like what it means, since 'garrulous' has that rattling quality when you say it aloud.
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