κρυπτέον
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)
one must hide, S.Ant.273, AP 5.251 (Paul. Sil.).
French (Bailly abrégé)
adj. verb. de κρύπτω.
Greek (Liddell-Scott)
κρυπτέον: ῥημ. ἐπίθ. τοῦ κρύπτω, δεῖ κρύπτειν, Σοφ. Ἀντ. 273, Ἀνθ. Π. 5. 252.
Greek Monotonic
κρυπτέον: ρημ. επίθ. του κρύπτω, σε Σοφ., Ανθ.
Dutch (Woordenboekgrieks.nl)
κρυπτέον adj. verb. van κρύπτω, het moet verborgen blijven.