συγγεγηθέναι

From LSJ

φιλοσοφίαν καινὴν γὰρ οὗτος φιλοσοφεῖ → this man adopts a new philosophy

Source

Greek > English (Woodhouse Verbs Reversed)

(see also: συγγηθέω) rejoice with another, sympathise with in joy, sympathise with