κακολόγος
From LSJ
νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
English (LSJ)
(parox.), ον,
A evil-speaking, slanderous, Pi.P.11.28, Men.256, Arist.Rh.1381b7; τινος of one, Id.EN 1125a8.
German (Pape)
[Seite 1301] übel redend, schmähend od. verläumdend; Pind. P. 11, 28; Com. in B. A. 353; Ggstz von ἐπαινετικός, Arist. Eth. 4, 3. – Adv., Poll. 8, 81.
Greek (Liddell-Scott)
κακολόγος: -ον, ὁ κακολογῶν, ὑβριστικός, Πινδ. Π. 11. 44· γραῦς τις κακολόγος Μένανδρ. ἐν «Κανηφόρῳ» 5, Ἀριστ. Ρητ. 2. 4, 18· κακολόγος οὐδὲ τῶν ἐχθρῶν ὁ αὐτ. ἐν Ἠθ. Ν. 4. 3, 31.