גָּדַע

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

Source

English (Strong)

a primitive root; to fell a tree; generally, to destroy anything: cut (asunder, in sunder, down, off), hew down.