disapproval If you say that someone prattles on about something, you are criticizing them because they are talking a great deal without saying anything important. Lou prattled on about various trivialities till I wanted to scream She prattled on as she drove out to the Highway Archie, shut up. You're prattling. = witter Prattle is also a noun. What a bore it was to listen to the woman's prattle!. to talk continuously about silly and unimportant things prattle away/on (pratelen)