From Mr. Earnshaw and his companions she kept aloof; and tutored by Kenneth, and serious threats of a fit that often attended her rages, her brother allowed her whatever she pleased to demand, and generally avoided aggravating her fiery temper.
Tell Isabella to shun me; this uproar is owing to her; and should she or any one else aggravate my anger at present, I shall get wild.
I would have made a few comments, and requested a short history of the place from the surly owner; but his attitude at the door appeared to demand my speedy entrance, or complete departure, and I had no desire to aggravate his impatience previous to inspecting the penetralium.
Well, Hareton’s aspect was the ghost of my immortal love; of my wild endeavours to hold my right; my degradation, my pride, my happiness, and my anguish — ’But it is frenzy to repeat these thoughts to you: only it will let you know why, with a reluctance to be always alone, his society is no benefit; rather an aggravation of the constant torment I suffer: and it partly contributes to render me regardless how he and his cousin go on together.
There are no more uses of "aggravate" in the book.