Translation of "hard case" into Russian

Joke! The Author GlosbeMT_RnD just left behind the comma in such a combination of two words in Russian as "фортепьяно пиано". First, it should have been "фортепьяно, пиано" (as far as the enumeration (listing) is concerned). Secondly, it's still an improper entry for the vocabulary: the Russian entry must be divided in two independent articles as "фортепьяно" and "пиано" with the obligatory remark for the latter - "slang" as Russians do say "пиано" in an extremely informal way... In short, as I already said, it's a hard case, meaning "really bad".