How is ‘Tacenda’ used in a sentence?

Tacenda is an obsolete (Ngram) term meaning:(from TFD)

• tacenda, tacit – Tacenda are things not to be mentioned or made public—things better left unsaid; tacit means “unspoken, silent” or “implied, inferred.”

• you are supposed to use more contemporary expressions (as suggested in a comment) such as taboo subject or the common saying elephant in the room.

A few literary examples of sentences using tacenda.

• Most people who attempted such a task would sink into being miserable blabbers of tacenda, mere sieves through which matters of secret importance would granulate into the hands of ardent journalists. But at once to stimulate and gratify curiosity, and to give a quiet circle the sense of being admitted to the inmost penetralia of affairs, is a triumph of conversational art.
  (Arthur Christopher Benson – From a College Window)

• That he was a fanatical moralist was something not even the broadest-minded among them suspected; they only knew that he meddled with a subject that was hitherto considered tacenda, and with dire results. Nowadays the thesis of Spring’s Awakening is not so novel.
  (James Huneker – Ivory Apes and Peacocks)

• Yet Zola lives despite these predictions, as the above figures show, notwithstanding his loquacity in regard to themes that should be tacenda to every writer. But in this matter of forbidden subjects Zola is regarded by the present generation as a trifle old-fashioned. When alive he was grouped with Aretino and the Marquis de Sade, or with Restif de la Bretonne.
  (James Huneker – Ivory Apes and Peacocks)

Source: www.wordincontext.com