absurd; adjective –  1) ridiculously unreasonable, unsound, or incongruous; 2) having no rational or orderly relationship to human life : meaningless

From the story “Metamorphosis” by Franz Kafka. “Then there was a ring at the door of the apartment. “That’s someone from the office,” he told himself, and he almost froze, while his small limbs only danced around all the faster. For one moment everything remained still. “They aren’t opening,” Gregor said to himself, caught up in some absurd hope. But of course then, as usual, the servant girl with her firm tread went to the door and opened it.” (Section I – paragraph 15)

Now I understand that Gregor wish the servant not going to open the door for this guest, but he knows this is a radicious hope because it’s not going to happen, and as the result the servent did open the door.