ἐπίορκ-ος, ον,
sworn falsely, of oaths, εἰ δέ τι τῶνδ᾽ ἐπίορκον 8th c.BC: Ilias Homerus Epicus “Illiad” 19.264: frequently in the phrase ἐπίορκον ὀμόσσαι take a false oath, swear falsely, [[ 3.279, 19.260, Hes. “Op.” 282, “Th.” 232 ] Refs]; in full, ἐπίορκον ὅρκον ὤμοσε [[5th-6th c.BC: Aristophanes Comicus “Ranae” 150; and so ἐ. ἐπομνύναι (see. ἐπόμνυμι); but in Il. 10.332 ἐ. ἐπώμοσε] Refs] he swore a bootless oath, i.e. one which he meant to fulfil, but the gods willed otherwise.
__II. of persons, forsworn, perjured, [[ Hes. “Op.” 804, “Schwyzer” 179a (from Crete), E. “El.” 1355 (_anapaest meter_), Ar. “Nu.” 399, +others] Refs]: superlative -ότατος 5th c.BC: Antipho Orator 6.48. adverb -κως 2nd c.AD: Herodianus Grammaticus 6.9.2.