μονόφωνος
From LSJ
πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced
English (LSJ)
ον,
A with but one voice or tone, of deaf-mutes, Hp.Carn.18.
German (Pape)
[Seite 206] oinstimmig, eintönig, Hippocr.
Greek (Liddell-Scott)
μονόφωνος: -ον, ὁ ἔχων ἢ ἐκπέμπων μίαν μόνην φωνήν, Ἱππ. 253. 39, 41.