certisso
From LSJ
Πολλὰ τὰ δεινὰ κοὐδὲν ἀνθρώπου δεινότερον πέλει → There are many wondrous things in this world, but none more wondrous than humans
certissō (certiscō), ĭs, ĕre ou ās, āre (certus), intr., être renseigné : Pacuv. 107 ; Gloss. 4, 217, 30.