χασματικός
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
German (Pape)
[Seite 1340] ὁ, σεισμός, nach Andern πρηστήρ, eine Erderschütterung, die große Schlünde hervorbringt, Sp.
