In a way that is excessively or annoyingly talkative; with much talking that may not be meaningful.
From 'garrulous' (Latin 'garrulus') plus the adverb-forming suffix '-ly,' creating an adverb meaning 'in a garrulous manner.'
The progression 'garrulus' (Latin for chattering) → 'garrulous' (English adjective) → 'garrulously' (English adverb) shows how a Latin imitative root became completely absorbed into English grammar across all word classes.
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