inutilidad
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
Spanish > Greek
ἀνωφέλεια, ἀχρειοσύνη, ἀχρείωσις, ἀχρηστία, ἀχρειότης, τό διακενῆς, ἀτέλεια, τὸ ἀνωφελές