ῥηματικός
From LSJ
καὶ τὸ σιγᾶν πολλάκις ἐστὶ σοφώτατον ἀνθρώπῳ νοῆσαι → and silence is often the wisest thing for a man to heed, and often is man's best wisdom to be silent, and often keeping silent is the wisest thing for a man to heed
English (LSJ)
ή, όν,
A of or for a verb: τὸ ῥ. a verbal form, D.H.Comp. 22, S.E.M.1.195; derived from a verb, A.D.Adv.135.14. Adv. -κῶς Eust.381.22.