γνωριστέον
From LSJ
Καλόν τοι τὸ ταύτης τῆς γῆς ὕδωρ, κακοὶ δὲ οἱ ἄνθρωποι. → Sweet is the water of this land, but the people are bad.
English (LSJ)
A one must know, Arist.EN1180b22; one may recognize, Alex.Trall.1.15.
Greek (Liddell-Scott)
γνωριστέον: ῥημ. ἐπίθ., πρέπει τις νὰ γνωρίσῃ, Ἀριστ. Ἠθ. Ν. 10. 9,16.
French (Bailly abrégé)
adj. verb. de γνωρίζω.