κενοφροσύνη
From LSJ
Ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → Whenever a poet is seated on the Muses' tripod, he is not in his senses
English (LSJ)
and κενό-φρων, v. κενεοφρ-.
German (Pape)
[Seite 1417] ἡ, übler Sinn, leerer Wahn; Plut. Ages. 37; Phot. erkl. ματαιοφροσύνη.