ἀκατάμαχος
From LSJ
αἰτῶ δ' ὑγίειαν πρῶτον, εἶτ' εὐπραξίαν, τρίτον δὲ χαίρειν, εἶτ' ὀφείλειν μηδενί → first health, good fortune next, and third rejoicing; last, to owe nought to any man
Greek (Liddell-Scott)
ἀκατάμαχος: -ον, = τῷ προηγ., Εὐσέβ. Εὐαγγ. Ἀποδ. 424D.
Spanish (DGE)
-ον inexpugnable, δύναμις Eus.DE 9.3.