tacenda means things that are not to be spoken about or made public. Lexicurio rates it Sui generis — a strength score of 86 out of 100.
Why “tacenda” is a great word
TACENDA — [Noun] Things that are best left unsaid or not to be spoken about publicly. From the Latin tacenda, neuter plural of the future passive participle of tacēre ("to be silent"). Unlike "taboo," which denotes a sacred or culturally codified prohibition, or "subtext," which is the meaning that lurks beneath spoken words, tacenda are the specific, pointed subjects one deliberately passes over in tactful silence. It is the mutual agreement to not mention the empty chair at the holiday table, the collective blindness to a friend's fresh heartbreak, and the deliberate letting of a tactless remark dissolve into the background hum of conversation—a social mortar, composed of restraint, that holds the fragile walls of civility intact, where the architecture of quietude defines the space more perfectly than any word.
Etymology
From Latin tacenda, future passive participle of taceo.
noun
- Things that are not to be spoken about or made public.
- Things that are best left unsaid.