In the Metamorphosis, Kafka makes it evident that Gregor endures a hellish existence as a bug. He works hard all the time, doesn't really have any kind of life, besides providing for his family and being very depressed, so when he is turned into a cockroach, his whole life turns upside down.
They Behavior and intelligence is really close to Humans behavior. Also, they have feeling and show them like humans do.
I think its ughhh A. B. C. D. E. F. G. H. I . J K
To compare loneliness to an undesirable illness or disease that is difficult to cure.