1) I stumbled upon an actual published citation for this word

"For me, popular Gentile epicaricacy is another of the deep mysteries of the Holocaust as unfathomable as the acts to be described in the pages ahead where I relate in graphic detail exactly what “they” said and did."
- Jakob Weiss, The Lemberg Mosaic (2010)

unfortunately, this appears to be a self-published work, so it's unlikely to be of any help in getting the word into any legitimate dictionary.

2) wiktionary has several earlier citations. none of them appear too helpful either.

citations

3) as to "pronunciation-hobbled epicaricacy", here is a link to someone actually pronouncing it:

hear, here
___

epicaricacy

(I should probly change my pronunciation guide..)