ἀκατάμεμπτος
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
Spanish (DGE)
-ον
1 completamente irreprochable, intachable de un difunto SEG 32.928 (Sicilia IV d.C.).
2 adv. -ως de un modo completamente irreprochable ἐμ πᾶσιν ἀκαταμέμπτως ἔχοντα IG 12(7).231 (Amorgos II/I a.C.).