having the habit of talking a lot, especially about things that are not important (Oxford)
talking a lot, especially about unimportant things (Cambridge)
I had talked too much about myself and felt like a garrulous old fool. (Cambridge)
He became positively garrulous after a few glasses of wine. (Oxford)
a garrulous old woman
another garrulous fool
Talkative
Gossipy
Taciturn
Concise
Garrulousness
Garrulously