Answer:
Gloomy and Bleak.
Step-by-step explanation:
The narrator mentions that he found himself "within view of the melancholy House of Usher". Also, phrases such as
"dull, dark, and soundless day"
"clouds hung oppressively low in the heavens, I had been passing alone, on horseback, through a singularly dreary tract of country" all suggests to the sense of aloofness, the bleak and gloomy nature of the narration.