ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
P. and V. ἄπιστος.
perjured: Ar. and P. ἐπίορκος.
crafty: Ar. and V. δόλιος; see crafty.