babble, blather, smatter, blether, blither -- (to talk foolishly; "The two women babbled and crooned at the baby")
Overview of adj blithe
The adj blithe has 2 senses
blithe -- (lacking or showing a lack of due concern; "spoke with blithe ignorance of the true situation")
blithe, blithesome, lighthearted, lightsome, light-hearted -- (carefree and happy and lighthearted; "was loved for her blithe spirit"; "a merry blithesome nature"; "her lighthearted nature"; "trilling songs with a lightsome heart")