Read the excerpt from Poe’s "The Fall of the House of Usher." Shaking this off with a gasp and a struggle, I uplifted myself upon the pillows, and, peering earnestly within the intense darkness of the chamber, hearkened -- I know not why, except that an instinctive spirit prompted me -- to certain low and indefinite sounds which came, through the pauses of the storm, at long intervals, I knew not whence. Overpowered by an intense sentiment of horror, unaccountable yet unendurable, I threw on my clothes with haste. Which word from this excerpt could be used to argue that the narrator is unreliable?