flibbertigibbet
🇺🇸
/ˈflɪbərtidʒɪbɪt/
🇬🇧
/ˈflɪbətidʒɪbɪt/
A person who is frivolous or talks a lot about unimportant things.
She's such a flibbertigibbet, always gossiping about the latest celebrity scandals.