μελαγχαίτης
From LSJ
τὸ γὰρ εὖ πράττειν παρὰ τὴν ἀξίαν ἀφορμὴ τοῦ κακῶς φρονεῖν τοῖς ἀνοήτοις γίγνεται → undeserved success engenders folly in unbalanced minds
English (LSJ)
ου, Dor. -τᾱς, α, ὁ,
A black-haired, of Centaurs, Hes.Sc.186, S.Tr.837 (lyr.); of Hades, E.Alc.439 (lyr.).