The headword as transmitted is ῥᾳδιέστερον (whereas the quotation has feminine ῥᾳδιεστέραν ); seemingly, then, the headword has been extracted from somewhere else.
[1] Polybius 11.1.1, on events of 207 BCE; cf. Livy 27.39.6. (Than what this was "easier and quicker" is left unstated: the Loeb translator, W.R.Paton, understands "than that of Hannibal had been"; Walbank in his commentary ad loc. prefers the vaguer "than expected".)