ἀτημελής
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)
ές,
A neglected, κόμη Plu.Ant.18. II of persons, careless, neglectful, χρημάτων E.Fr.184. Adv. -λῶς, ἔχειν τινός Plu.Agis 17; ἀτημελέως ἀλάληντο A.R.1.812 (v.l. -λέες).