Thanks for looking that up. I was wondering which words were used in positive, neutral, or negative connotations. I think that "clever" in your first example above has slightly negative aspect, as in "scheming". "Acute" sounds positive. I also went to dictionary to check if "assiduous" has any negative aspect, and it does not seem it has. Does it sound the same as "diligent pleasing manners"?
Now that I got to Chapter 5, I am shocked by Elizabeth's conceit. Can it be called snobbishness when she is equally dismissive of Anne and Mrs. Clay? Or one can argue the opposite, that snobbishness is just the outward expression of a conceited mind?