Other forms of the word nepenthe?

I make here a strange connection to anhedonia (not a form of nepenthe, of course, but related in sense tangentially)...that state of consciousness in which we are incapable of feeling joy.

It seems there is a gap between the anhedonic (n. person, if that's a word) and the nepenthiac (n. person, if that's a word)--one feeling joy no more, and the other, no pain--but a gap between the two people--they're still in different places, though alike.

WW