εὐθυθάνατος
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
English (LSJ)
[θᾰ], ον,
A quick-killing, mortal, πληγή Plu.Ant.76.
German (Pape)
[Seite 1070] sogleich tödtend, πληγή, Plut. Ant. 76.
Greek (Liddell-Scott)
εὐθυθάνατος: -ον, ταχέως φονεύων, θανάσιμος, πληγὴ Πλουτ. Ἀντών. 76.