ἐχθρῶς
From LSJ
ἐπ' αὐτὸν ἐπενθρῴσκει πυρὶ καὶ στεροπαῖς ὁ Διὸς γενέτας, δειναὶ δ' ἅμ᾽ ἕπονται κῆρες ἀναπλάκητοι → the son of Zeus is springing upon him with fiery lightning, and with him come the dread unerring Fates
French (Bailly abrégé)
adv.
en ennemi, avec inimitié;
Cp. ἐχθροτέρως.
Étymologie: ἐχθρός.
Russian (Dvoretsky)
ἐχθρῶς: враждебно, по-вражески Xen., Plat., Plut.