καταστρεπτικῶς
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
Adv. A so as to end, ἐπ' αὐτά, opp. ἀνεκτικῶς (fort. κατενεκτικῶς) ἐφ' ἕτερα, Stoic.3.34 ap.Sch.Luc.Bis Acc.22 (v.l. κατατρεπτικῶς).
Greek (Liddell-Scott)
καταστρεπτικῶς: Ἐπίρρ., = καταστροφικῶς, Σχόλ. εἰς Λουκ. Δὶς Κατηγ. 21, τοῦ ἐπιθέτ. καταστρεπτικός, ή, όν, ἐπιτήδειος εἰς τὸ καταστρέφειν.