πεπεῖσθαι

From LSJ

πολλὰ τὰ δεινὰ κοὐδὲν ἀνθρώπου δεινότερον πέλειmany things are formidable, and none more formidable than man | wonders are many, and none is more wonderful than man | many things are bad, but nothing is more atrocious than man

Source

Greek > English (Woodhouse Verbs Reversed)

(see also πείθω): be certain, be confident, be convinced, be positive, be sure