He was a blithering idiot.

他是个十足的傻瓜。

She is alway blithering about some problems of hers.

她总是唠叨不休地讲她（人）一些问题。

I spent more than two hours on listening to a blithering report yesterday afternoon.

昨天下午我花了两个多小时听了个无聊的报告。

She admitted that her comments suggesting that karmic retribution may have caused the devastating earthquakes in China were blithering.

她承认，她所谓中国严重地震灾害是报应的言论是胡说八道。