συνευφραίνεσθαι
From LSJ
τὸν τεθνηκότα μὴ κακολογεῖν → do not speak ill of the dead, speak no ill of the dead (Chilon the Spartan)
Greek > English (Woodhouse Verbs Reversed)
(see also: συνευφραίνομαι) rejoice with another, sympathise with in joy, sympathise with