τὸ ζῷον τοῦτο οὐ μονῆρες καὶ αὐθέκαστον, ἀλλὰ κοινωνικὸν καὶ πολιτικόν → this animal is not solitary and self-sufficient, but social and political
lightly: V. κούφως, Ar. ἐλαφρῶς.
cheerfully: P. and V. εὐθύμως.