δεινότης
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
ητος, ἡ,
A terribleness, Th.3.59,4.10; harshness, severity, νόμων Id.3.46. II cleverness, shrewdness, D.18.144, Arist. EN1144a23; opp. ἀλήθεια, Antipho5.5; esp. in an orator, Th.3.37, D.18.242,277; ἡ ἐν τοῖς λόγοις δ. Isoc.1.4; δεινότητα λόγου ἐπιδείκνυσθαι Plu.Pomp.77. III Rhet., intensity, forcefulness, D.H. Comp.18, Th.53, al., Longin.34.4, Hermog.Id.2.9, al.: pl., Demetr. Eloc.243.