"blither" in the verb sense
1. babble, blather, smatter, blether, blither
to talk foolishly
"The two women babbled and crooned at the baby"
"blither" in the adjective sense
1. blithe
lacking or showing a lack of due concern
"spoke with blithe ignorance of the true situation"
2. 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"
Source: WordNet® (An amazing lexical database of English)
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