δυσπολέμητος
From LSJ
ὡς μήτε τὰ γενόμενα ἐξ ἀνθρώπων τῷ χρόνῳ ἐξίτηλα γένηται → in order that so the memory of the past may not be blotted out from among men by time
English (LSJ)
ον,
A hard to war with, A.Supp.648 (lyr., s.v.l.), Isoc.4.138; εἰ δέ τις . . δ. οἴεται τὸν φίλιππον εἶναι D.4.4; δ. ὅπλον, offriendship, Luc.Tox.36.