mischievously
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
adv.
Harmfully: P. ἀνεπιτηδείως, P. and V. κακῶς. Maliciously: P. φθονερῶς, ἐπιφθόνως. Wickedly: P. κακούργως:Ar. and P. πανούργως. Saucily - P. ὑβριστικῶς. Wantonly: Ar. and P. νεανικῶς.