Sentence:  He did not boast, but it naturally betrayed itself, that he had persuaded his aunt where his uncle could do nothing, and on her laughing and noticing it, he owned that he believed (excepting one or two points) he could with time persuade her to any thing. ... The <WSD>unpersuadable</WSD> point, which he did not mention, Emma guessed to be good behaviour to his father. 
Meaning of the word marked with <WSD> tags:  Of which one cannot be persuaded.