The adjective garrulous refers to an excessive talkativeness or rumbling in a roundabout manner over unnecessary or pointless things.
Synonyms are talkative, chatty, blabby, or loquacious.
The word origins from Latin (1610s) garrulus meaning “talkative or chattering” from garrire meaning “to chatter” plus -ulus, deverbal suffix meaning a repetitive action.
I first liked him because of his looks, but a guy who is garrulous is a major turn off.
I was planning to sleep during my whole ride home but driver was garrulous.
A garrulous friend always saves awkward situations.