Sentence:  It was her other self who had written that letter. It not only bored, it rather disgusted her real self. "Flippant and silly," said her real self. Yet she knew that she'd send it and she'd always write that kind of <WSD>twaddle</WSD> to Nan Pym. 
Meaning of the word marked with <WSD> tags:  Empty or silly idle talk or writing; nonsense, rubbish. (from 1782.)