constant, endless, incessant
Her constant chatter was starting to annoy me.

excited, nervous, noisy | idle
I wish you''d stop wasting time in idle chatter.

~ about
She was full of chatter about her new friends.

excitedly, happily | away, on
He chattered on happily for about half an hour.

about
We chattered about work.

to
chattering excitedly to her friends