ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
φλυαρώδης, εὐτράπελος, ἀπῳδός, μάταιος, ληρώδης, πυλαϊκός