ἀληθευτής
From LSJ
ἀπορράπτειν τὸ Φιλίππου στόμα ὁλοσχοίνῳ ἀβρόχῳ → sew up Philip's mouth with an unsoaked rush, stop Philip's mouth with an unsoaked rush, shut one's mouth without any trouble
English (LSJ)
οῦ, ὁ,
A truth-speaking person, ἀ. λόγων Max.Tyr.21.6.
German (Pape)
[Seite 94] ὁ, λόγων, der stets die Wahrheit spricht, Man. Tyr.
Greek (Liddell-Scott)
ἀληθευτής: -οῦ, ὁ, φιλαλήθης ἄνθρωπος, εἰλικρινής, Μάξ. Τύρ. 21. 6.