δυσπέμφελος
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
English (LSJ)
ον,
A rough and stormy, εἰ καὶ δυσπέμφελος εἴη (sc. πόντος) Il.16.748: as a general epith. of the sea, οἳγλαυκὴν δυσπέμφελον ἐργάζονται Hes.Th.440; ναυτιλίη δ. stormy passage, Id.Op.618; αὔρη Nonn.D.2.550: metaph., rude, uncourteous, Hes.Op.722; δ. εὐνή, of a wife, Max.88.