I think pride is the most serious sin. Because people get into trouble on account of their stupid pride. Sometimes pride is necessary for people. For example as for their important job, to acquire one's knowledge, to grant one's request. People do that they doesn't wont in fact to their stupid pride.
People do to ruin by it.
I think sloth is the most serious sin. I think human being who have not motivation doesn't have one of the most important thing in his life. I think lust is the most serious sin because fat man is an ugly and cannot manage by myself. I think fat man should easy exercise. For example, walking is a good exercise.