δυσεκπόνητος
From LSJ
ἐπὶ τῷ μὴ κοινωνικῶς χρῆσθαι τοῖς εὐτυχήμασι → for not having used their success in a spirit of partnership
English (LSJ)
δυσεκπόνητον, τιμωρίας καὶ πόνους δυς[εκπο] νήτους hard to endure, Phld.Herc.1251.12 (dub. rest.).
Spanish (DGE)
-ον difícil de soportar πόνοι Phld.Elect.12.8.