[Meaning] folly, insolence.[1]
Procopius [writes]: "those being wronged are accustomed to turn to senselessness",[2] as the Blues when they suffered at the hands of Justinian. "And first the [styles] of the factions concerning their hair were adapted to new fashion. For they did not cut it at all as the others did. They did not attend to their moustaches or beards at all, but they wished to grow it out forever, as long as possible, just like the Persians. But the hair on their heads in the front they cut up to their temples; the hair in back they allowed to hang down to a great length for no reason, just like the Massagetae. Wherefore this very style was called 'Hunnic'. And they thought their cloaks should be finely-bordered."[3]
And elsewhere Julian [writes]: "not to foresee what is possible and what is impossible in matters is a sign of the utmost senselessness."[4]