μέρμερος
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 baneful, Hom. (only in Il.) always in neut. pl., μέρμερα μητίσασθαι to devise mischief, 10.48; μ. ῥέζων 11.502; μ. μήσατο ἔργα 10.289, cf. 524; in Hom. always of warlike deeds, πολέμοιο μ. ἔργα 8.453; but μ. ῥέζων, of Zeus, Orph.Fr.21a; μ. ἔργα γυναικῶν the ills that women work, Hes.Th.603; μ. κακόν E.Rh. 509; βλάβη Lyc.949; ἀδρανίη Nic.Th.248. II of persons, captious, fastidious, Pl.Hp.Ma.290e; ἔθνος Λατίνων D.P.350; μ. χρῆμα crafty creature, of a fox, Plu.2.988a; of a hound, Opp.C.1.490.— Ep. word, used in E. and Pl. ll. cc.