unbezwingbar
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
German > Latin
-zwinglich: unbezwingbar, -zwinglich, indomitus (unbezähmbar). – invictus (unbesiegbar; beide von leb. Wesen). – inexpugnabilis (unbestürmbar, von Orten). – unbezwungen, invictus.