κενόφρων
From LSJ
εἰ πάλιν ἔστι γενέσθαι, ὕπνος σ' ἔ̣χει οὐκ ἐπὶ δηρόν, εἰ δ' οὐκ ἔστιν πάλιν ἐλθεῖν, αἰώ̣νιος ὕπνος → if it is possible for you to be born again, you will fall asleep, briefly; if it is not possible to return — it would be eternal sleep
German (Pape)
[Seite 1417] ονος, Leeres, Nichtiges sinnend, βουλεύματα Aesch. Prom. 761.
Greek (Liddell-Scott)
κενόφρων: -ον, (φρὴν) ἔχων κενὸν νοῦν, κενὰς φρένας, ματαιόφρων, βουλεύματα Αἰσχύλ. Πρ. 762· πρβλ. κενεόφρων.