Read the excerpt below and answer the question. Her sister, Miss Watson, a tolerable slim old maid, with goggles on, had just come to live with her, and took a set at me now with a spelling-book. She worked me middling hard for about an hour, and then the widow made her ease up. I couldn't stood it much longer. Then for an hour it was deadly dull, and I was fidgety. Miss Watson would say, "Don't put your feet up there, Huckleberry;" and "Don't scrunch up like that, Huckleberry-set up straight;" and pretty soon she would say, "Don't gap and stretch like that, Huckleberry-why don't you try to behave?"

In at least one hundred words, explain how Twain uses descriptive adjectives to characterize Miss Watson in this excerpt.