παραδειγματιστέον
From LSJ
ἡ γὰρ σιωπὴ μαρτυρεῖ τὸ μὴ θέλειν → silence is evidence of unwillingness (Menander)
English (LSJ)
A one must punish for example's sake, Id.35.2.10.
Greek (Liddell-Scott)
παραδειγματιστέον: ῥηματ. ἐπίθετ. τοῦ παραδειγματίζω, δεῖ παραδειγματίζειν, Πολύβ. 35. 2, 10.