λειόγλωσσος
From LSJ
οὗτος μὲν ὁ πιθανώτερος τῶν λόγων εἴρηται, δεῖ δὲ καὶ τὸν ἧσσον πιθανόν, ἐπεί γε δὴ λέγεται, ῥηθῆναι → this is the most credible of the stories told; but I must relate the less credible tale also, since they tell it
English (LSJ)
ον,
A smooth-tongued, flattering, Sm., Thd.Pr.6.24.
German (Pape)
[Seite 24] glattzüngig, schmeichlerisch, Sp.
Greek (Liddell-Scott)
λειόγλωσσος: -ον, ἔχων λείαν γλῶσσαν, κολακευτικός, Σύμμ. Παλ. Διαθ.