ἀναμφισβητήσιμος
From LSJ
Τραφὲν ὄρεσι καὶ φάραγξιν ἀγρίαις, κήρυξ πέφυκα τῆς λόγου ὑμνῳδίας. Φωνήν μὲν οὐκ ἔναρθρον, εὔηχον δ' ἔχω (Byzantine riddle) → Raised in the mountains and wild ravines, I have become the herald of hymns that are sung. I have no articulate voice...
German (Pape)
[Seite 199] unbestreitbar, gewiß.
Greek (Liddell-Scott)
ἀναμφισβητήσιμος: -ον, μὴ ἐπιδεχόμενος ἀμφισβήτησιν, Εὐσεβ. Βίος Κωνστ.