σεμνοπροσωπέω
From LSJ
καὶ ὑποθέμενος κατὰ τῆς κεφαλῆς φέρειν τὰς πληγάς, ὡς ἐν ἐκείνῃ τοῦ τε κακοῦ τοῦ πρὸς ἀνθρώπους → and having instructed them to bring their blows against the head, seeing that the harm to humans ... (Josephus, Antiquities of the Jews 1.50)
English (LSJ)
A assume a grave, solemn countenance, ἐπί τινι Ar.Nu.363, cf. AP11.382.14 (Agath.).
German (Pape)
[Seite 871] eine ehrwürdige, ernsthafte, vornehme Miene annehmen; Ar. Nubb. 362; Agath. 69 (XI, 382); D. Cass. 65, 5.
French (Bailly abrégé)
-ῶ :
prendre un air grave : ἐπί τινι à l’adresse de qqn.
Étymologie: σεμνός, πρόσωπον.