Don't know, but I found this short blurb:
Another word for Schadenfreude
But I couldn't find "epicaricacy" in Merriam-Webster's site, so maybe it's not a word.
On the other hand, the word "sadism" might work.
Though my point was that English can still use auxiliary words to describe it, even if it may not be a one-word equivalent. English is not a one-word kind of language. It's not like German.
For example, here, we have words like President, Congress, and Supreme Court, yet in German, it's all summed up with one word: Fuhrer. (And there's another word that hardly gets translated.)