Not P but DFW: slimy resentment

[Mike Jing]

The following excerpt is from David Foster Wallace's *Joseph Frank's
Dostoevsky*:

or the unbelievably repellent Smerdyakov, that living engine of slimy
resentment in whom I personally see parts of myself I can barely stand to
look at;

What does "slimy" mean here?

Smerdyakov, of course, is a character in Dostoevsky's novel *The Brothers
Karamazov*.