καταστύφω
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
[ῡ],
A astringe: metaph. in Pass., of a person, αὐστηρὸς καὶ κατεστυμμένος Men.Rh.p.389S.; τὸ κατεστ. sourness, harshness, Plu.Cat.Mi.46.