unsayable

1. (philosophy) Not capable of being said.Examples: "Whatsoever has been said before me, even on any subject, surely it belongs thereto that it can be repeated by me in rehearsal, and hence it does not seem possible that in this sense it should be so fitly called unspeakable or unsayable."; "Nonetheless, in some unsayable way, value sentences are about values and reflect the structure of values."; "The unsaid drives us to “speak;” but, in some ways, there are limitations on what we can say, because some part always remains unsaid — we must always attempt to say the unsayable."Synonyms: inexpressible

2. (rare) Not allowed or not fit to be said.Examples: "His task: to say the unsayable. To say all the words we have normally suppressed and to say them and say them and say them."; "In Oakland, Rachel Blau's lawn is green because it rained recently. But if there's no rain, "we let it go," she says, bravely adding the unsayable "I don't care how it looks.""; "He was sacked, rather, for, saying the unsayable: for telling the truth."Synonyms: taboo, unspeakablerare