To utter or make meaningless sounds suggestive of the chatter of children: Babble. (Merriam – Webster)
To talk in a silly way or like a child for a long time about things that are not important or without saying anything important. (Cambridge Dictionary)
If you say that someone prattles on about something, you are criticising them because they are talking a great deal without saying anything important. (Collins Dictionary)
The prattle about the Grexit is dangerous for Europe.
Four platter antonyms.