ἐπαγγελτικός
From LSJ
ξένῳ δὲ σιγᾶν κρεῖττον ἢ κεκραγέναι → it's better for a stranger to keep silence than to shout (Menander)
English (LSJ)
ή, όν,
A given to promising, ἐπεκλήθη Δώσων ὡς ἐ. Plu.Aem.8; also [λόγος] πρὸς τοὺς πολλοὺς ἐ. Phld.Rh.2.2.S., cf. Iamb.Myst.3.30. Adv. -κῶς Ath.Mech.15.9: Comp. -κώτερον, εἰπεῖν too professorially, Arist.Rh.1398b30. 2 promised, οὐ δύνασθαι τελεῖν τὸ ἐ. ἀργύριον SIG832.7 (Epist. Hadr.).