δυσάλγητος
From LSJ
τὸ κακὸν δοκεῖν ποτ' ἐσθλὸν τῷδ' ἔμμεν' ὅτῳ φρένας θεὸς ἄγει πρὸς ἄταν → evil appears as good to him whose mind the god is leading to destruction (Sophocles, Antigone 622f.)
English (LSJ)
ον,
A hard to be borne, most painful, Eup. 410. II unfeeling, hard-hearted, S.OT12; δειλὸς ἢ δ. φρένας Id.Fr.952.