unbezwingbar
From LSJ
ἀκίνδυνοι δ' ἀρεταὶ οὔτε παρ' ἀνδράσιν οὔτ' ἐν ναυσὶ κοίλαις τίμιαι → but excellence without danger is honored neither among men nor in hollow ships
German > Latin
-zwinglich: unbezwingbar, -zwinglich, indomitus (unbezähmbar). – invictus (unbesiegbar; beide von leb. Wesen). – inexpugnabilis (unbestürmbar, von Orten). – unbezwungen, invictus.