σιωπητέος
From LSJ
Sunt verba voces quibus hunc lenire dolorem possis, magnam morbi deponere partem → Words will avail the wretched mind to ease and much abate the dismal black disease.
English (LSJ)
α, ον,
A to be passed over in silence, Luc.Hist. Conscr.27. II σιωπητέον, one must pass over in silence, ib.6.
Greek (Liddell-Scott)
σιωπητέος: -α, -ον, ῥηματ. ἐπίθετ., ὃν πρέπει τις νὰ παρέλθῃ ἐν σιωπῇ, Λουκ. πῶς δεῖ Ἱστ. Συγγρ. 35. ΙΙ. σιωπητέον, πρέπει τις νὰ παρέλθῃ ἐν σιωπῇ, αὐτόθι 6.