τανταλόω
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
German (Pape)
[Seite 1067] wie ταλαντόω, = τανταλεύω, schwanken, bewegen, Soph. Ant. 135, τανταλωθείς, geschleudert.