oponente
From LSJ
ὑμῖν ἔξεστι εὐδαίμοσι γενέσθαι → to you it is permitted to be joyful, it is permitted to be happy, it is permitted to be fortunate, vobis licet esse beatis
Spanish > Greek
ἀντεργάτης, ἀντιδύναμος, ἀντιστάτης, ἐναντιολόγος, ἀντιφάσκων