garrulous formal talking a lot, especially about unimportant things
A garrulous old man was sitting near me in the bar.
He became more garrulous as the evening went on.
you can’t shut him/her up informal used to say humorously that someone talks all the time
You can’t shut him up so I never get any work done when he’s here.
chatterbox informal someone, especially a child, who talks a lot
Cathy’s a real chatterbox.
Examples from the Corpus
talkative• The wine was making her more relaxed and talkative.• When enforcingrules, parents need not and generally should not be very talkative.• Mulcahey at least was talkative and attentive.• Somehow I always end up alone in a room with my talkativeaunt.• I was very talkative before marriage but after marriage I don't know what happened to me.• He was not talkative, but once wound up he charmed them all with his stories of life in California.• They are not a talkativepair.• She would have been a talkative woman if she could.