ἀνταγωνιστής
From LSJ
Ἐχθροῖς ἀπιστῶν οὔποτ' ἂν πάθοις βλάβην → Minus dolebis, quo hostibus credes minus → Dem Feind misstrauend bleibst von Schaden du verschont
English (LSJ)
οῦ, ὁ,
A opponent, competitor, rival, Dialex.2.7, X.Cyr.1.6.8, 3.3.36, Alex.272; τινί τινος X.Hier. 4.6, etc.; ἀ. ἔρωτος a rival in love, E.Tr.1006, cf. Pl.R.554e, al.; χαλεποὶ ἀ. τοῖς βαρβάροις Isoc.4.75; ἀ. τῆς παιδείας opponents of their system of education, Arist.Pol.1338b37; ἀ. ἔχειν τινὰ ταῖς ἐπιβολαῖς Plb.2.45.5.
German (Pape)
[Seite 243] , ὁ, Nebenbuhler, ἐν τῷ σταδίῳ Alex. Ath. II, 49 e; Xen. Cyr. 3, 3, 36; τινὶ πλούτου, im Reichthum, Hier. 4, 6; Feind, im Kriege, Cyr. 1, 6, 8; vor Gericht, Isocr. 4, 75; Pol. 2, 45.