Sentence:  The <WSD>undesirableness</WSD> of any other house in the same neighbourhood for Sir Walter was certainly much strengthened by one part, and a very material part of the scheme, which had been happily engrafted on the beginning. He was not only to quit his home, but to see it in the hands of others; a trial of fortitude, which stronger heads than Sir Walter's have found too much. 
Meaning of the word marked with <WSD> tags:  The condition or quality of being undesirable.