ἀληθευτής
From LSJ
Τὰς γὰρ ἡδονὰς ὅταν προδῶσιν ἄνδρες, οὐ τίθημ' ἐγὼ ζῆν τοῦτον, ἀλλ' ἔμψυχον ἡγοῦμαι νεκρόν → But when people lose their pleasures, I do not consider this life – rather, it is just a corpse with a soul
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.