undecimus

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

Latin > English (Lewis & Short)

undĕcĭmus: a, um, num. adj. unusdecimus,
I the eleventh: legio, Liv. 30, 18, 10: annus, Verg. E. 8, 39: dies, Plin. 11, 54, 118, § 283.