εὔαρχος
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
ον,
A governing well, Lvc.233. 2 easily governed, Arist.Oec.1344b14. II beginning well, λόγος Luc.Lex.1; making a good beginning, of one's first customer in the market, AP6.304 (Phan., s.v.l.).