Sentence:  "Essays about what?" / "Oh—<WSD>rubbish</WSD> mostly." / There was a moment's pause. / "Oh, Lovat, don't be so silly. You "know" you don't think your essays <WSD>rubbish</WSD>," put in Harriet. "They're about life, and democracy, and equality, and all that sort of thing," Harriet explained. 
Meaning of the word marked with <WSD> tags:  Nonsense.