κυφαγωγὸς
From LSJ
ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving
English (LSJ)
ἵππος, ὁ, a horse that goes with the neck arched, X.Eq.7.10.
Greek (Liddell-Scott)
κῡφᾰγωγὸς: ἵππος, ὁ, βαδίζων μὲ αὐχένα κυρτόν, καμαρωτὸν καὶ τὴν κεφαλὴν κύπτουσαν πρὸς τὰ κάτω, Ξεν. Ἱππ. 7, 10.