βαρύστομος
From LSJ
Ἔργοις φιλόπονος ἴσθι, μὴ λόγοις μόνον → Lass Taten sprechen, führ nicht bloß das große Wort - Esto opere, non sermone solo industrius → Sei arbeitsam im Handeln nicht im Reden bloß
English (LSJ)
ον,
A heavy in pronunciation, of the first syllable of σκῆπτρον, Phld.Po.2.14 (dub.). 2 of heavy, i.e. abusive, mouth, Nonn.D.48.420. 3 of a weapon, cutting deeply, Opp.H.4.481.