Assuming the passage you are referring to is from "The Pit and the Pendulum" by Edgar Allan Poe, the correct answer is frightening and disquieting. In the passage, we can see that a man is observing something creeping into the darkness, moving stealthily around him. The atmosphere is quite eerie and terrifying, and it makes your hair stand on end. Poe is the master of creating this type of atmosphere in his literature, which is why he is considered to be one of the greatest Gothic and horror writers and poets of all time.