Babbling
WordNet
adjective
(1) Talking idly or incoherently
"Blithering (or blathering) idiot"
"Jabbering children"
"Gabbling housewives"
"A babbling hospital inmate"
(2) Continuous low murmuring sound; as especially of water
"A babbling brook"
noun
(3) Gibberish resembling the sounds of a baby