βδέλος

From LSJ

τὸ γὰρ εὖ πράττειν παρὰ τὴν ἀξίαν ἀφορμὴ τοῦ κακῶς φρονεῖν τοῖς ἀνοήτοις γίγνεται → undeserved success engenders folly in unbalanced minds

Source

Spanish (DGE)

-ου, ὁ humo de la mecha de la lucerna op. καπνός, ἀτμός, αἰθάλη Sch.A.Th.494b.
• Etimología: v. βδελυρός.