treacherously
From LSJ
πρὸ τελευτῆς μὴ μακάριζε μηδένα, καὶ ἐν τέκνοις αὐτοῦ γνωσθήσεται ἀνήρ → Count no man blessed before his end; a man will be recognized in his offspring. (Ecclesiasticus 11:28)
Ar. and V. δόλῳ, P. ἐξ ἐπιβουλῆς, V. σὺν δόλῳ; see by treachery, under treachery.