Which two adjectives does the narrator use to prove that he is not mad in the first paragraph?

The following are two adjectives the narrator uses to try to convince the reader that he is not mad.
First, the narrator calls himself nervous, insisting that to be nervous is quite different from being truly insane, or, as he says, "mad." He says,

True! — nervous — very, very dreadfully nervous I had been and am; but why will you say that I am mad?

He speaks as though he is responding to someone who is accusing him of being "mad," and he is trying to convince whoever that audience is that he is, indeed, in his right mind. He seems to mean, in this context, that he is easily excited, or even agitated. The narrator goes on to say that,

The disease had sharpened [his] senses — not destroyed — not dulled them. Above all was the sense of hearing acute.

Here, his word choice of acute seems meant to convey that his senses, especially his hearing, have become incredibly sensitive and that he perceives the world in a very intense way. Together, his quickness to agitate and his sensitive perception have, in his mind, combined to produce effects that might seem like madness but really are not.