ἀνεκδιήγητος
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)
ον,
A indescribable, ineffable, 2 Ep.Cor.9.15, Hsch., v.l. in Aristeas99.
German (Pape)
[Seite 221] unbeschreiblich, Sp., auch adv.