ἀγρυπνητέον
From LSJ
καὶ νῦν ἀτεχνῶς ἐθέλω παρέχειν ὅ τι βούλει σοι, πλὴν κωλακρέτου γάλα πίνειν → and now I want to provide you with absolutely anything you want, except paymaster's milk to drink
English (LSJ)
A one must watch, Eust 168.16.
Greek (Liddell-Scott)
ἀγρυπνητέον: ῥηματ. ἐπίθ., πρέπει νὰ ἀγρυπνῇ τις, Εὐστ. Ἰλ. Β. 25.
Spanish (DGE)
hay que vigilar, mantenerse alerta Eust.168.16.