γραμματική ἐστιν ἐμπειρία τῶν παρὰ ποιηταῖς τε καὶ συγγραφεῦσιν ὡς ἐπὶ τὸ πολὺ λεγομένων → grammar is a practical knowledge of the usage of poets and writers of prose
P. and V. δυσμενής, δύσνους, Ar. and P. κακόνους, V. κακόφρων.
faithless: P. and V. ἄπιστος.